cmake-modules

title: cmake-modules(7)

summary: CMake Modules Reference

text:
# cmake-modules(7)

## NAME
cmake-modules - CMake Modules Reference

The modules listed here are part of the CMake distribution. Projects may provide further modules; their location(s) can be specified in the CMAKE_MODULE_PATH <#variable:CMAKE_MODULE_PATH> variable.

## UTILITY MODULES
These modules are loaded using the include() <#command:include> command.

### AndroidTestUtilities
Added in version 3.7.

This module provides a command to create a test that pushes data needed for testing an Android device behavior onto a connected Android device.

Load this module in a CMake project with:

```
include(AndroidTestUtilities)
```

### Commands
This module provides the following command:

android_add_test_data

Creates a test that automatically loads specified data onto an Android device:

```
android_add_test_data(

  <test-name>

  [FILES <files>...]

  [FILES_DEST <device-dir>]

  [LIBS <libs>...]

  [LIBS_DEST <device-dir>]

  DEVICE_OBJECT_STORE <device-dir>

  DEVICE_TEST_DIR <device-dir>

  [NO_LINK_REGEX <regexes>...]
)
```

This command accepts files and libraries needed to run project-specific tests as well as separate destinations for each. It will create a test that loads the files into a device object store and link to them from the specified destination. The files are only uploaded if they are not already in the object store.

On the host operating system, files and libraries are copied at build time. For on-device testing, the files are loaded onto the device by the manufactured test at run time.

This command accepts the following named parameters:

FILES <files>...

Zero or more files needed for testing.

FILES_DEST <device-dir>

Absolute path where the data files are expected to be.

LIBS <libs>...

Zero or more libraries needed for testing.

LIBS_DEST <device-dir>

Absolute path where the libraries are expected to be.

DEVICE_OBJECT_STORE <device-dir>

Absolute path to the on-device location where the data files are initially stored.

DEVICE_TEST_DIR <device-dir>

Absolute path to the root directory of the on-device test location.

NO_LINK_REGEX <regexes>...

A list of regular expression patterns matching file names to be copied from the object store to the test directory, instead of being symlinked.

### Examples
The following example shows how to use this module to create a test named example_setup_test that prepares data during the build phase. This test can then be run using ctest(1) <#manual:ctest(1)> to load the data onto the Android device.

CMakeLists.txt

```
include(AndroidTestUtilities)
android_add_test_data(

  example_setup_test

  FILES data/protobuffer.p data/file.txt

  LIBS libs/library_1 libs/library_2

  DEVICE_OBJECT_STORE "/sdcard/.ExternalData/SHA"

  DEVICE_TEST_DIR "/data/local/tests/example"
)
```

### BundleUtilities
This module provides utility commands for assembling standalone, bundle-style applications with CMake, such as macOS .app bundles or similar directory-based application bundles on other operating systems.

Load this module in a CMake installation with:

```
include(BundleUtilities)
```

Note:

Do not use this module at configure time (from CMakeLists.txt). Instead, include it and invoke its commands from an install(CODE) <#code> or install(SCRIPT) <#script>.

### Commands
This module provides the following commands:

- fixup_bundle()

- copy_and_fixup_bundle()

- verify_app()

- get_bundle_main_executable()

- get_dotapp_dir()

- get_bundle_and_executable()

- get_bundle_all_executables()

- get_item_key()

- get_item_rpaths()

- clear_bundle_keys()

- set_bundle_key_values()

- get_bundle_keys()

- copy_resolved_item_into_bundle()

- copy_resolved_framework_into_bundle()

- fixup_bundle_item()

- verify_bundle_prerequisites()

- verify_bundle_symlinks()

fixup_bundle

Prepares a bundle for distribution by fixing up its internal dependencies:

```
fixup_bundle(<app> <libs> <dirs> [IGNORE_ITEM <files>...])
```

This command modifies the <app> bundle in-place to make it self-contained and portable, so that it can be drag-n-drop copied to another machine and run there, assuming all of the system libraries are compatible.

This command collects all dependencies (keys) for the executables and libraries in the bundle. For each dependency, it copies the required files into the bundle and adjusts them according to their own prerequisites. Once complete, it clears the collected keys and invokes the verify_app() command to ensure the final bundle is truly standalone.

The arguments are:

<app>

The path to the bundle to fix. This can be an .app directory or direct path to an executable.

<libs>

A list of libraries that must be fixed up, but that cannot be automatically determined by the otool output analysis (i.e. plugins). If plugins are passed to this command as this parameter, they should be installed or copied into the bundle before calling this command.

<dirs>

A list of paths where libraries might be found. These paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib, etc.

IGNORE_ITEM <files>...

Added in version 3.6.

Optional list of file names to ignore (e.g. IGNORE_ITEM "vcredist_x86.exe;vcredist_x64.exe").

copy_and_fixup_bundle

Copies the bundle and fixes up the new copied bundle in-place:

```
copy_and_fixup_bundle(<src> <dst> <libs> <dirs>)
```

This command makes a copy of the bundle <src> at location <dst> and then fixes up the new copied bundle in-place at <dst>.

The arguments are:

<src>

The directory of the bundle being copied.

<dst>

The destination directory of the bundle copy.

<libs>

A list of libraries that must be fixed up, but that cannot be automatically determined by the otool output analysis (i.e. plugins). If plugins are passed to this command as this parameter, they should be installed or copied into the bundle before calling this command.

<dirs>

A list of paths where libraries might be found. These paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib, etc.

verify_app

Verifies that an application bundle appears valid based on running analysis tools on it:

```
verify_app(<app> [IGNORE_ITEM <files>...])
```

If the application fails verification, a message(FATAL_ERROR) <#command:message> is issued, halting the installation process.

The arguments are:

<app>

The path to the application to verify. This can be a .app directory or a standalone executable.

IGNORE_ITEM <files>...

Added in version 3.6.

Optional list of file names to ignore (e.g. IGNORE_ITEM "vcredist_x86.exe;vcredist_x64.exe").

get_bundle_main_executable

Retrieves the main executable within a given application bundle:

```
get_bundle_main_executable(<bundle> <result-var>)
```

The result is stored in a <result-var> variable and will contain a full path name of the bundle's main executable file, or an error: prefixed string if it could not be determined.

get_dotapp_dir

Locates the enclosing .app directory for the given executable:

```
get_dotapp_dir(<exe> <dotapp-dir-var>)
```

This command retrieves the nearest parent dir whose name ends with .app given the full path to an executable and stores it to the <dotapp-dir-var> variable. If there is no such parent dir, then it simply retrieves the directory containing the executable.

The retrieved directory may or may not exist.

get_bundle_and_executable

Takes either a .app directory name or the name of an executable nested inside a .app directory and retrieves the path to the .app directory and the path to its main executable:

```
get_bundle_and_executable(<app> <bundle-var> <executable-var> <valid-var>)
```

The arguments are:

<app>

The name of the application being processed.

<bundle-var>

Variable name in which to store the resulting path to the .app directory. In case of any error, this variable will contain an error message prefixed with string error:.

<executable-var>

Variable name in which to store the resulting main executable. In case of any error, this variable will contain an error message prefixed with string error:.

<valid-var>

Variable name in which the boolean result is stored whether this command was successful or not.

get_bundle_all_executables

Gets all executables of a given bundle:

```
get_bundle_all_executables(<bundle> <exes-var>)
```

This command scans <bundle> bundle recursively for all executable files and stores them into a variable <exes-var>.

get_item_key

Generates a unique key for the given item:

```
get_item_key(<item> <key-var>)
```

Given <item> file name, this command generates <key-var> key that should be unique considering the set of libraries that need copying or fixing up to make a bundle standalone. This is essentially the file name including extension with . replaced by _.

This key is used as a prefix for CMake variables so that a set of variables can be associated with a given item based on its key.

get_item_rpaths

Gets RPATHS (run-time search paths) for the given item:

```
get_item_rpaths(<item> <rpaths-var>)
```

This command gets RPATHS of the <item> file name and stores them to the variable with provided name <rpaths-var>.

clear_bundle_keys

Clears all variables associated with keys:

```
clear_bundle_keys(<keys-var>)
```

This command loops over the <keys-var> list of keys, clearing all the variables associated with each key. After the loop, it clears the list of keys itself. This command should be called after the get_bundle_keys() command, when done working with a list of keys.

set_bundle_key_values

Adds a key to the list of keys:

```
set_bundle_key_values(

  <keys-var>

  <context>

  <item>

  <exepath>

  <dirs>

  <copyflag>

  [<rpaths>]
)
```

This command adds the <keys-var> key to the list (if necessary) for the given item. If added, also set all the variables associated with that key.

The arguments are:

<keys-var>

Variable name holding the name of the key to be added to the list for the given item.

<context>

The path to the top level loading path used for @loader_path replacement on Apple operating systems. When resolving item, @loader_path references will be resolved relative to the directory of the given context value (presumably another library).

<item>

The item for which to add the key.

<exepath>

The path to the top level executable used for @executable_path replacement on Apple operating systems.

<dirs>

A list of paths where libraries might be found. These paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib, etc.

<copyflag>

If set to 1 library symlink structure will be preserved.

<rpaths>

Optional run-time search paths for an executable file or library to help find files.

get_bundle_keys

Gets bundle keys:

```
get_bundle_keys(<app> <libs> <dirs> <keys-var> [IGNORE_ITEM <files>...])
```

This command loops over all the executable and library files within <app> bundle (and given as extra <libs>) and accumulate a list of keys representing them. It sets values associated with each key such that they can be looped over all of them and copies prerequisite libs into the bundle and then does appropriate install_name_tool fixups.

The arguments are:

<app>

The path to the bundle to fix. This can be an .app directory or direct path to an executable.

<libs>

A list of libraries that must be fixed up, but that cannot be automatically determined by the otool output analysis (i.e. plugins). If plugins are passed to this command as this parameter, they should be installed or copied into the bundle before calling this command.

<dirs>

A list of paths where libraries might be found. These paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib, etc.

<keys-var>

Variable name holding a list of keys that represent all executable and library files within the bundle.

IGNORE_ITEM <files>...

Added in version 3.6.

Optional list of file names to ignore (e.g. IGNORE_ITEM "vcredist_x86.exe;vcredist_x64.exe").

copy_resolved_item_into_bundle

Copies a resolved item into the bundle if necessary:

```
copy_resolved_item_into_bundle(<resolved-item> <resolved-embedded-item>)
```

Copy is not necessary, if the <resolved-item> is "the same as" the <resolved-embedded-item>.

copy_resolved_framework_into_bundle

Copies a resolved framework into the bundle if necessary:

```
copy_resolved_framework_into_bundle(<resolved-item> <resolved-embedded-item>)
```

Copy is not necessary, if the <resolved-item> is "the same as" the <resolved-embedded-item>.

The following variables can be set before invoking this command:

BU_COPY_FULL_FRAMEWORK_CONTENTS

By default, this variable is not set. If full frameworks should be embedded in the bundles, set this variable to boolean true before calling the fixup_bundle() command. By default, this command copies the framework dylib itself plus the framework Resources directory.

fixup_bundle_item

Fixes up bundle item:

```
fixup_bundle_item(<resolved-embedded-item> <exepath> <dirs>)
```

This command gets the direct/non-system prerequisites of the <resolved-embedded-item> and for each prerequisite, it changes the way it is referenced to the value of the _EMBEDDED_ITEM keyed variable for that prerequisite. Most likely changing to an @executable_path style reference.

This command requires that the <resolved-embedded-item> be inside the bundle already. In other words, if plugins are passed to fixup_bundle() command as its <libs> parameter, they should be installed or copied into the bundle before calling the fixup_bundle() command.

Also, it changes the id of the item being fixed up to its own _EMBEDDED_ITEM value.

Changes are accumulated in a local variable and one call is made to install_name_tool command-line tool at the end of this command with all the changes at once.

The arguments are:

<resolved-embedded-item>

The bundle item to be fixed up.

<exepath>

The path to the top level executable used for @executable_path replacement on Apple operating systems.

<dirs>

A list of paths where libraries might be found. These paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib, etc.

The following variables can be set before invoking this command:

BU_CHMOD_BUNDLE_ITEMS

If this variable is set to boolean true value then bundle items will be marked writable before install_name_tool tool tries to change them.

verify_bundle_prerequisites

Verifies that the sum of all prerequisites of all files inside the bundle are contained within the bundle or are system libraries, presumed to exist everywhere:

```
verify_bundle_prerequisites(

  <bundle>

  <result-var>

  <info-var>

  [IGNORE_ITEM <files>...]
)
```

The arguments are:

<bundle>

Name of the bundle being verified.

<result-var>

Name of the variable in which to store a boolean result of whether a verification was successful.

<info-var>

Name of the variable holding any informational messages produced by the verification.

IGNORE_ITEM <files>...

Added in version 3.6.

Optional list of file names to ignore (e.g. IGNORE_ITEM "vcredist_x86.exe;vcredist_x64.exe").

verify_bundle_symlinks

Verifies that any symlinks found in the specified bundle point to other files that are already also in the bundle:

```
verify_bundle_symlinks(<bundle> <result-var> <info-var>)
```

Anything that points to an external file causes this command to fail the verification.

The arguments are:

<bundle>

Name of the bundle being verified.

<result-var>

Name of the variable in which to store a boolean result of whether a verification was successful.

<info-var>

Name of the variable holding any informational messages produced by the verification.

### Examples
Using this module inside the installation code that is executed at the installation phase:

CMakeLists.txt

```
# ...
install(CODE "

  include(BundleUtilities)

  set(BU_CHMOD_BUNDLE_ITEMS TRUE)

  fixup_bundle(

    \"${fixup_exe}\"

    \"${plugins}\"

    \"${bin_dir};${library_dir};${binary_dir}\"

  )
")
```

### CheckCCompilerFlag
This module provides a command to check whether the C compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckCCompilerFlag)
```

### Commands
This module provides the following command:

check_c_compiler_flag

Checks once whether the C compiler supports a given flag:

```
check_c_compiler_flag(<flag> <variable>)
```

This command checks once that the <flag> is accepted by the C compiler without producing a diagnostic message. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

The result of the check is stored in the internal cache variable specified by <variable>, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check support for the C compiler flag -fno-optimize-strlen, which disables optimizations related to the strlen() C function in GCC and Clang compilers. The result of the check is stored in the internal cache variable HAVE_FNO_OPTIMIZE_STRLEN, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to C source files.

```
include(CheckCCompilerFlag)
check_c_compiler_flag(-fno-optimize-strlen HAVE_FNO_OPTIMIZE_STRLEN)
if(HAVE_FNO_OPTIMIZE_STRLEN)

  target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:C>:-fno-optimize-strlen>

  )
endif()
```

### See Also
•

The CheckCompilerFlag <#module:CheckCompilerFlag> module for a more general command to check whether a compiler flag is supported.

### CheckCompilerFlag
Added in version 3.19.

This module provides a command to check whether the compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckCompilerFlag)
```

### Commands
This module provides the following command:

check_compiler_flag

Checks once whether the compiler supports a given flag:

```
check_compiler_flag(<lang> <flag> <variable>)
```

This command checks once that the <flag> is accepted by the <lang> compiler without producing a diagnostic message. The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<lang>

The language of the compiler used for the check. Supported languages are: C, CXX, CUDA, Fortran, HIP, ISPC, OBJC, and OBJCXX, and Swift. Added in version 3.21: Support for HIP language.

Added in version 3.26: Support for Swift language.

<flag>

Compiler flag(s) to check. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check support for the C compiler flag -fno-optimize-strlen, which disables optimizations related to the strlen() C function in GCC and Clang compilers. The result of the check is stored in the internal cache variable HAVE_FNO_OPTIMIZE_STRLEN, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to C source files.

```
include(CheckCompilerFlag)
check_compiler_flag(C -fno-optimize-strlen HAVE_FNO_OPTIMIZE_STRLEN)
if(HAVE_FNO_OPTIMIZE_STRLEN)

  target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:C>:-fno-optimize-strlen>

  )
endif()
```

### See Also
•

The CheckLinkerFlag <#module:CheckLinkerFlag> module to check whether a linker flag is supported by the compiler.

### CheckCSourceCompiles
This module provides a command to check whether a C source can be built.

Load this module in a CMake project with:

```
include(CheckCSourceCompiles)
```

### Commands
This module provides the following command:

check_c_source_compiles

Checks once whether the given C source code can be built:

```
check_c_source_compiles(<code> <variable> [FAIL_REGEX <regexes>...])
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable). The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<code>

C source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If one or more regular expression patterns are provided, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
Checking whether C source code containing SSE2 intrinsic can be compiled and linked:

```
include(CheckCSourceCompiles)
check_c_source_compiles([[

  #include <emmintrin.h>

  int main(void)

  {

    __m128d a = _mm_setzero_pd();

    (void)a;

    return 0;

  }
]] PROJECT_HAVE_SSE2_INTRINSICS)
```

### See Also

- The CheckSourceCompiles <#module:CheckSourceCompiles> module for a more general command to check whether source can be built.

- The CheckSourceRuns <#module:CheckSourceRuns> module to check whether source can be built and run.

### CheckCSourceRuns
This module provides a command to check whether a C source can be built and run.

Load this module in a CMake project with:

```
include(CheckCSourceRuns)
```

### Commands
This module provides the following command:

check_c_source_runs

Checks once whether the given C source code compiles and links into an executable that can subsequently be run:

```
check_c_source_runs(<code> <variable>)
```

The C source supplied in <code> must contain at least a main() function. The result of the check is stored in the internal cache variable specified by <variable>. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
The following example demonstrates how to use this module to check whether the C source code is supported and operational at runtime. The result of the check is stored in the internal cache variable HAVE_NORETURN.

```
include(CheckCSourceRuns)
check_c_source_runs([[

  #include <stdlib.h>

  #include <stdnoreturn.h>

  noreturn void f(){ exit(0); }

  int main(void) { f(); return 1; }
]] HAVE_NORETURN)
```

### See Also

- The CheckSourceRuns <#module:CheckSourceRuns> module for a more general command syntax.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckCXXCompilerFlag
This module provides a command to check whether the C++ compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckCXXCompilerFlag)
```

### Commands
This module provides the following command:

check_cxx_compiler_flag

Checks once whether the C++ compiler supports a given flag:

```
check_cxx_compiler_flag(<flag> <variable>)
```

This command checks once that the <flag> is accepted by the CXX compiler without producing a diagnostic message. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

The result of the check is stored in the internal cache variable specified by <variable>, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check the C++ compiler flag -fsycl. The result of the check is stored in the internal cache variable HAVE_FSYCL_FLAG, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to CXX source files.

```
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag(-fsycl HAVE_FSYCL_FLAG)
if(HAVE_FSYCL_FLAG)

  target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-fsycl>

  )
endif()
```

### See Also
•

The CheckCompilerFlag <#module:CheckCompilerFlag> module for a more general command to check whether a compiler flag is supported.

### CheckCXXSourceCompiles
This module provides a command to check whether a C++ source can be built.

Load this module in a CMake project with:

```
include(CheckCXXSourceCompiles)
```

### Commands
This module provides the following command:

check_cxx_source_compiles

Checks once whether the given C++ source code can be built:

```
check_cxx_source_compiles(<code> <variable> [FAIL_REGEX <regexes>...])
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable). The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<code>

C++ source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If one or more regular expression patterns are provided, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to check whether the C++ compiler supports a specific language feature. In this case, the check verifies if the compiler supports C++11 lambda expressions. The result is stored in the internal cache variable HAVE_CXX11_LAMBDAS:

```
include(CheckCXXSourceCompiles)
check_cxx_source_compiles([[

  int main()

  {

    auto lambda = []() { return 42; };

    return lambda();

  }
]] HAVE_CXX11_LAMBDAS)
```

### See Also

- The CheckSourceCompiles <#module:CheckSourceCompiles> module for a more general command to check whether source can be built.

- The CheckSourceRuns <#module:CheckSourceRuns> module to check whether source can be built and run.

### CheckCXXSourceRuns
This module provides a command to check whether a C++ source can be built and run.

Load this module in a CMake project with:

```
include(CheckCXXSourceRuns)
```

### Commands
This module provides the following command:

check_cxx_source_runs

Checks once whether the given C++ source code compiles and links into an executable that can subsequently be run:

```
check_cxx_source_runs(<code> <variable>)
```

The C++ source supplied in <code> must contain at least a main() function. The result of the check is stored in the internal cache variable specified by <variable>. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
The following example demonstrates how to check whether the C++ standard library is functional and std::vector works at runtime. If the source compiles, links, and runs successfully, internal cache variable HAVE_WORKING_STD_VECTOR will be set to boolean true value. Code is supplied using Bracket Argument <#bracket-argument> for easier embedded quotes handling:

```
include(CheckCXXSourceRuns)
check_cxx_source_runs([[

  #include <iostream>

  #include <vector>

  int main()

  {

    std::vector<int> v = {1, 2, 3};

    if (v.size() != 3) return 1;

    std::cout << "Vector works correctly." << std::endl;

    return 0;

  }
]] HAVE_WORKING_STD_VECTOR)
```

### See Also

- The CheckSourceRuns <#module:CheckSourceRuns> module for a more general command syntax.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckCXXSymbolExists
This module provides a command to check whether a C++ symbol exists.

Load this module in a CMake project with:

```
include(CheckCXXSymbolExists)
```

### Commands
This module provides the following command:

check_cxx_symbol_exists

Checks once whether a symbol exists as a function, variable, or preprocessor macro in C++:

```
check_cxx_symbol_exists(<symbol> <headers> <variable>)
```

This command checks whether the <symbol> is available after including the specified header file(s) <headers>, and stores the result in the internal cache variable <variable>. Multiple header files can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

If the header files define the symbol as a macro, it is considered available and assumed to work. If the symbol is declared as a function or variable, the check also ensures that it links successfully (i.e., the symbol must exist in a linked library or object file).

Symbols that are types, enum values, or C++ templates are not recognized. For those, consider using the CheckTypeSize <#module:CheckTypeSize> or CheckSourceCompiles <#module:CheckSourceCompiles> module instead.

This command is intended to check symbols as they appear in C++. For C symbols, use the CheckSymbolExists <#module:CheckSymbolExists> module instead.

Note:

This command is unreliable for symbols that are (potentially) overloaded functions. Since there is no reliable way to predict whether a given function in the system environment may be defined as an overloaded function or may be an overloaded function on other systems or will become so in the future, it is generally advised to use the CheckSourceCompiles <#module:CheckSourceCompiles> module for checking any function symbol (unless it is certain the checked function is not overloaded on other systems or will not be so in the future).

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
The following example demonstrates how to check for the presence of a preprocessor macro SEEK_SET and the C++ function std::fopen() from the <cstdio> header using this module:

```
include(CheckCXXSymbolExists)
# Check for macro SEEK_SET
check_cxx_symbol_exists(SEEK_SET "cstdio" HAVE_SEEK_SET)
# Check for function std::fopen
check_cxx_symbol_exists(std::fopen "cstdio" HAVE_STD_FOPEN)
```

### See Also
•

The CheckSymbolExists <#module:CheckSymbolExists> module to check whether a C symbol exists.

### CheckFortranCompilerFlag
Added in version 3.3.

This module provides a command to check whether the Fortran compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckFortranCompilerFlag)
```

### Commands
This module provides the following command:

check_fortran_compiler_flag

Checks once whether the Fortran compiler supports a given flag:

```
check_fortran_compiler_flag(<flag> <variable>)
```

This command checks once that the <flag> is accepted by the Fortran compiler without producing a diagnostic message. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

The result of the check is stored in the internal cache variable specified by <variable>, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check the Fortran compiler flag -fallow-argument-mismatch. The result of the check is stored in the internal cache variable HAVE_FORTRAN_FLAG, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to Fortran source files.

```
include(CheckFortranCompilerFlag)
check_fortran_compiler_flag(-fallow-argument-mismatch HAVE_FORTRAN_FLAG)
if(HAVE_FORTRAN_FLAG)

  target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:Fortran>:-fallow-argument-mismatch>

  )
endif()
```

### See Also
•

The CheckCompilerFlag <#module:CheckCompilerFlag> module for a more general command to check whether a compiler flag is supported.

### CheckFortranFunctionExists
This module provides a command to check whether a Fortran function exists.

Load this module in a CMake project with:

```
include(CheckFortranFunctionExists)
```

### Commands
This module provides the following command:

check_fortran_function_exists

Checks once whether a Fortran function exists:

```
check_fortran_function_exists(<function> <variable>)
```

<function>

The name of the Fortran function.

<variable>

The name of the variable in which to store the check result. This variable will be created as an internal cache variable.

Note:

This command does not detect functions provided by Fortran modules. In general, it is recommended to use CheckSourceCompiles <#module:CheckSourceCompiles> instead to determine whether a Fortran function or subroutine is available.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

### Example: Isolated Check With Linked Libraries
In the following example, this module is used in combination with the CMakePushCheckState <#module:CMakePushCheckState> module to temporarily modify the required linked libraries (via CMAKE_REQUIRED_LIBRARIES) and verify whether the Fortran function dgesv is available for linking. The result is stored in the internal cache variable PROJECT_HAVE_DGESV:

```
include(CheckFortranFunctionExists)
include(CMakePushCheckState)
find_package(LAPACK)
if(TARGET LAPACK::LAPACK)

  cmake_push_check_state(RESET)

  set(CMAKE_REQUIRED_LIBRARIES LAPACK::LAPACK)

  check_fortran_function_exists(dgesv PROJECT_HAVE_DGESV)

  cmake_pop_check_state()
endif()
```

### See Also

- The CheckFunctionExists <#module:CheckFunctionExists> module to check whether a C function exists.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether source code can be compiled.

### CheckFortranSourceCompiles
Added in version 3.1.

This module provides a command to check whether a Fortran source can be built.

Load this module in a CMake project with:

```
include(CheckFortranSourceCompiles)
```

### Commands
This module provides the following command:

check_fortran_source_compiles

Checks once whether the given Fortran source code can be built:

```
check_fortran_source_compiles(

  <code>

  <variable>

  [FAIL_REGEX <regexes>...]

  [SRC_EXT <extension>]
)
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable). The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<code>

Fortran source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If this option is provided with one or more regular expressions, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

SRC_EXT <extension>

Added in version 3.7.

By default, the test source file used for the check will be given a .F file extension. This option can be used to override this with .<extension> instead - .F90 is a typical choice.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
Checking whether the Fortran compiler supports the pure procedure attribute:

```
include(CheckFortranSourceCompiles)
check_fortran_source_compiles("

  pure subroutine foo()

  end subroutine

  program test

    call foo()

  end
" HAVE_PURE SRC_EXT "F90")
```

### See Also

- The CheckSourceCompiles <#module:CheckSourceCompiles> module for a more general command to check whether source can be built.

- The CheckSourceRuns <#module:CheckSourceRuns> module to check whether source can be built and run.

### CheckFortranSourceRuns
Added in version 3.14.

This module provides a command to check whether a Fortran source can be built and run.

Load this module in a CMake project with:

```
include(CheckFortranSourceRuns)
```

### Commands
This module provides the following command:

check_fortran_source_runs

Checks once whether the given Fortran source compiles and links into an executable that can subsequently be run.

```
check_fortran_source_runs(<code> <variable> [SRC_EXT <extension>])
```

The Fortran source supplied in <code> must contain a Fortran program unit. The result of the check is stored in the internal cache variable specified by <variable>. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

The options are:

SRC_EXT <extension>

By default, the internal test source file used for the check will be given a .F90 file extension. This option can be used to change the extension to .<extension> instead.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
The following example shows how to use this module to check whether a Fortran source code runs and store the result of the check in an internal cache variable HAVE_COARRAY:

```
include(CheckFortranSourceRuns)
check_fortran_source_runs([[

  program test

  real :: x[*]

  call co_sum(x)

  end program
]] HAVE_COARRAY)
```

### See Also

- The CheckSourceRuns <#module:CheckSourceRuns> module for a more general command syntax.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckFunctionExists
This module provides a command to check whether a C function exists.

Load this module in a CMake project with:

```
include(CheckFunctionExists)
```

### Commands
This module provides the following command:

check_function_exists

Checks once whether a C function can be linked from system libraries:

```
check_function_exists(<function> <variable>)
```

This command checks whether the <function> is provided by libraries on the system, and stores the result in an internal cache variable <variable>.

Note:

Prefer using CheckSymbolExists <#module:CheckSymbolExists> or CheckSourceCompiles <#module:CheckSourceCompiles> instead of this command, for the following reasons:

- check_function_exists() can't detect functions that are inlined in headers or defined as preprocessor macros.

- check_function_exists() can't detect anything in the 32-bit versions of the Win32 API, because of a mismatch in calling conventions.

- check_function_exists() only verifies linking, it does not verify that the function is declared in system headers.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Example: Basic Usage
In the following example, a check is performed to determine whether the linker sees the C function fopen(), and the result is stored in the HAVE_FOPEN internal cache variable:

```
include(CheckFunctionExists)
check_function_exists(fopen HAVE_FOPEN)
```

### Example: Missing Declaration
As noted above, the CheckSymbolExists <#module:CheckSymbolExists> module is preferred for checking C functions, since it also verifies whether the function is declared or defined as a macro. In the following example, this module is used to check an edge case where a function may not be declared in system headers. For instance, on macOS, the fdatasync() function may be available in the C library, but its declaration is not provided in the unistd.h system header.

CMakeLists.txt

```
include(CheckFunctionExists)
include(CheckSymbolExists)
check_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
# Check if fdatasync() is available in the C library.
if(NOT HAVE_FDATASYNC)

  check_function_exists(fdatasync HAVE_FDATASYNC_WITHOUT_DECL)
endif()
```

In such a case, the project can provide its own declaration if missing:

example.c

```
#ifdef HAVE_FDATASYNC_WITHOUT_DECL

  extern int fdatasync(int);
#endif
```

### See Also

- The CheckSymbolExists <#module:CheckSymbolExists> module to check whether a C symbol exists.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be compiled.

- The CheckFortranFunctionExists <#module:CheckFortranFunctionExists> module to check whether a Fortran function exists.

### CheckIncludeFile
This module provides a command to check C header file.

Load this module in a CMake project with:

```
include(CheckIncludeFile)
```

### Commands
This module provides the following command:

check_include_file

Checks once whether a header file exists and can be included in C code:

```
check_include_file(<include> <variable> [<flags>])
```

The arguments are:

<include>

A header file to be checked.

<variable>

The name of the variable to store the result of the check. This variable will be created as an internal cache variable.

<flags>

(Optional) A space-separated string of additional compilation flags to be added to the check. Alternatively, flags can be also specified with the CMAKE_REQUIRED_FLAGS variable below.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

Added in version 3.12: The CMAKE_REQUIRED_LIBRARIES variable, if policy CMP0075 <#policy:CMP0075> is set to NEW.

### Example: Checking C Header
Checking whether the C header <unistd.h> exists and storing the check result in the HAVE_UNISTD_H cache variable:

```
include(CheckIncludeFile)
check_include_file(unistd.h HAVE_UNISTD_H)
```

### Example: Isolated Check
In the following example, this module is used in combination with the CMakePushCheckState <#module:CMakePushCheckState> module to temporarily modify the required compile definitions (via CMAKE_REQUIRED_DEFINITIONS) and verify whether the C header <ucontext.h> is available. The result is stored in the internal cache variable HAVE_UCONTEXT_H.

For example, on macOS, the ucontext API is deprecated, and headers may be hidden unless certain feature macros are defined. In particular, defining _XOPEN_SOURCE (without a value) can expose the necessary symbols without enabling broader POSIX or SUS (Single Unix Specification) features (values 500 or greater).

```
include(CheckIncludeFile)
include(CMakePushCheckState)
cmake_push_check_state(RESET)

  if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")

    set(CMAKE_REQUIRED_DEFINITIONS -D_XOPEN_SOURCE)

  endif()

  check_include_file(ucontext.h HAVE_UCONTEXT_H)
cmake_pop_check_state()
```

### See Also

- The CheckIncludeFileCXX <#module:CheckIncludeFileCXX> module to check for single C++ header.

- The CheckIncludeFiles <#module:CheckIncludeFiles> module to check for one or more C or C++ headers at once.

### CheckIncludeFileCXX
This module provides a command to check a C++ header file.

Load this module in a CMake project with:

```
include(CheckIncludeFileCXX)
```

### Commands
This module provides the following command:

check_include_file_cxx

Checks once whether a header file exists and can be included in C++ code:

```
check_include_file_cxx(<include> <variable> [<flags>])
```

The arguments are:

<include>

A header file to be checked.

<variable>

The name of the variable to store the result of the check. This variable will be created as an internal cache variable.

<flags>

(Optional) A space-separated string of additional compilation flags to be added to the check. Alternatively, flags can be also specified with the CMAKE_REQUIRED_FLAGS variable below.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

Added in version 3.12: The CMAKE_REQUIRED_LIBRARIES variable, if policy CMP0075 <#policy:CMP0075> is set to NEW.

### Examples
Checking whether the C++23 header <stdfloat> exists and storing the check result in the HAVE_STDFLOAT_HEADER cache variable:

```
include(CheckIncludeFileCXX)
check_include_file_cxx(stdfloat HAVE_STDFLOAT_HEADER)
```

### See Also

- The CheckIncludeFile <#module:CheckIncludeFile> module to check for single C header.

- The CheckIncludeFiles <#module:CheckIncludeFiles> module to check for one or more C or C++ headers at once.

### CheckIncludeFiles
This module provides a command to check one or more C/C++ header files.

Load this module in a CMake project with:

```
include(CheckIncludeFiles)
```

### Commands
This module provides the following command:

check_include_files

Checks once whether one or more header files exist and can be included together in C or C++ code:

```
check_include_files(<includes> <variable> [LANGUAGE <language>])
```

The arguments are:

<includes>

A semicolon-separated list <#cmake-language-lists> of header files to be checked.

<variable>

The name of the variable to store the result of the check. This variable will be created as an internal cache variable.

LANGUAGE <language>

Added in version 3.11.

If set, the specified <language> compiler will be used to perform the check. Acceptable values are C and CXX. If this option is not given, the C compiler will be used if enabled. If the C compiler is not enabled, the C++ compiler will be used if enabled.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

Added in version 3.12: The CMAKE_REQUIRED_LIBRARIES variable, if policy CMP0075 <#policy:CMP0075> is set to NEW.

### Examples
Checking one or more C headers and storing the check result in cache variables:

```
include(CheckIncludeFiles)
check_include_files(sys/socket.h HAVE_SYS_SOCKET_H)
if(HAVE_SYS_SOCKET_H)

  # The <net/if.h> header on Darwin and BSD-like systems is not self-contained

  # and also requires <sys/socket.h>

  check_include_files("sys/socket.h;net/if.h" HAVE_NET_IF_H)
else()

  check_include_files(net/if.h HAVE_NET_IF_H)
endif()
```

The LANGUAGE option can be used to specify which compiler to use. For example, checking multiple C++ headers, when both C and CXX languages are enabled in the project:

```
include(CheckIncludeFiles)
check_include_files("header_1.hpp;header_2.hpp" HAVE_HEADERS LANGUAGE CXX)
```

### See Also

- The CheckIncludeFile <#module:CheckIncludeFile> module to check for a single C header.

- The CheckIncludeFileCXX <#module:CheckIncludeFileCXX> module to check for a single C++ header.

### CheckIPOSupported
Added in version 3.9.

This module provides a command to check whether the compiler supports interprocedural optimization (IPO/LTO).

Load this module in a CMake project with:

```
include(CheckIPOSupported)
```

Interprocedural optimization is a compiler technique that performs optimizations across translation units (i.e., across source files), allowing the compiler to analyze and optimize the entire program as a whole rather than file-by-file. This can improve performance by enabling more aggressive inlining and dead code elimination. When these optimizations are applied at link time, the process is typically referred to as link-time optimization (LTO), which is a common form of IPO.

In CMake, interprocedural optimization can be enabled on a per-target basis using the INTERPROCEDURAL_OPTIMIZATION <#prop_tgt:INTERPROCEDURAL_OPTIMIZATION> target property, or for all targets in the current scope using the CMAKE_INTERPROCEDURAL_OPTIMIZATION <#variable:CMAKE_INTERPROCEDURAL_OPTIMIZATION> variable.

Use this module before enabling the interprocedural optimization on targets to ensure the compiler supports IPO/LTO.

### Commands
This module provides the following command:

check_ipo_supported

Checks whether the compiler supports interprocedural optimization (IPO/LTO):

```
check_ipo_supported(

  [RESULT <result-var>]

  [OUTPUT <output-var>]

  [LANGUAGES <lang>...]
)
```

Options are:

RESULT <result-var>

Set <result-var> variable to YES if IPO is supported by the compiler and NO otherwise. If this option is not given then the command will issue a fatal error if IPO is not supported.

OUTPUT <output-var>

Set <output-var> variable with details about any error.

LANGUAGES <lang>...

Specify languages whose compilers to check. The following languages are supported:

- C

- CXX

- CUDA Added in version 3.25.

- Fortran

If this option is not given, the default languages are picked from the current ENABLED_LANGUAGES <#prop_gbl:ENABLED_LANGUAGES> global property.

Note:

To use check_ipo_supported(), policy CMP0069 <#policy:CMP0069> must be set to NEW; otherwise, a fatal error will occur.

Added in version 3.13: Support for Visual Studio Generators <#visual-studio-generators>.

Added in version 3.24: The check uses the caller's CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> values. See policy CMP0138 <#policy:CMP0138>.

### Examples
Checking whether the compiler supports IPO and emitting a fatal error if it is not supported:

```
include(CheckIPOSupported)
check_ipo_supported() # fatal error if IPO is not supported
set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
```

The following example demonstrates how to use this module to enable IPO for the target only when supported by the compiler and to issue a warning if it is not. Additionally, projects may want to provide a configuration option to control when IPO is enabled. For example:

```
option(FOO_ENABLE_IPO "Enable IPO/LTO")
if(FOO_ENABLE_IPO)

  include(CheckIPOSupported)

  check_ipo_supported(RESULT result OUTPUT output)

  if(result)

    set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)

  else()

    message(WARNING "IPO is not supported: ${output}")

  endif()
endif()
```

### CheckLanguage
This module provides a command to check whether a language can be enabled using the enable_language() <#command:enable_language> or project() <#command:project> commands.

Load this module in a CMake project with:

```
include(CheckLanguage)
```

This module is useful when a project does not always require a specific language but may need to enable it for certain parts.

### Commands
This module provides the following command:

check_language

Checks whether a language can be enabled in a CMake project:

```
check_language(<lang>)
```

This command attempts to enable the language <lang> in a test project and records the results in the following cache variables:

CMAKE_<LANG>_COMPILER <#variable:CMAKE_<LANG>_COMPILER>

If the language can be enabled, this variable is set to the compiler that was found. If the language cannot be enabled, this variable is set to NOTFOUND. If this variable is already set, either explicitly or cached by a previous call, the check is skipped.

CMAKE_<LANG>_HOST_COMPILER <#variable:CMAKE_<LANG>_HOST_COMPILER>

This variable is set when <lang> is CUDA or HIP. If the check detects an explicit host compiler that is required for compilation, this variable will be set to that compiler. If the check detects that no explicit host compiler is needed, this variable will be cleared.

If this variable is already set, its value is preserved only if CMAKE_<LANG>_COMPILER <#variable:CMAKE_<LANG>_COMPILER> is also set. Otherwise, the check runs and overwrites CMAKE_<LANG>_HOST_COMPILER <#variable:CMAKE_<LANG>_HOST_COMPILER> with a new result. Note that CMAKE_<LANG>_HOST_COMPILER <#variable:CMAKE_<LANG>_HOST_COMPILER> documents it should not be set without also setting CMAKE_<LANG>_COMPILER <#variable:CMAKE_<LANG>_COMPILER> to a NVCC compiler.

CMAKE_<LANG>_PLATFORM <#variable:CMAKE_HIP_PLATFORM>

This variable is set to the detected GPU platform when <lang> is HIP. If this variable is already set, its value is always preserved. Only compatible values will be considered for CMAKE_<LANG>_COMPILER <#variable:CMAKE_<LANG>_COMPILER>.

### Examples
The following example checks for the availability of the Fortran language and enables it if possible:

```
include(CheckLanguage)
check_language(Fortran)
if(CMAKE_Fortran_COMPILER)

  enable_language(Fortran)
else()

  message(STATUS "No Fortran support")
endif()
```

### CheckLibraryExists
This module provides a command to check whether a C library exists.

Load this module in a CMake project with:

```
include(CheckLibraryExists)
```

### Commands
This module provides the following command:

check_library_exists

Checks once whether a specified library exists and a given C function is available:

```
check_library_exists(<library> <function> <location> <variable>)
```

This command attempts to link a test executable that uses the specified C <function> to verify that it is provided by either a system or user-provided <library>.

The arguments are:

<library>

The name of the library, a full path to a library file, or an Imported Target <#imported-targets>.

<function>

The name of a function that should be available in the system or user-provided library <library>.

<location>

The directory containing the library file. It is added to the link search path during the check. If this is an empty string, only the default library search paths are used.

<variable>

The name of the variable in which to store the check result. This variable will be created as an internal cache variable.

Note:

This command is intended for performing basic sanity checks to verify that a library provides the expected functionality, or that the correct library is being located. However, it only verifies that a function symbol can be linked successfully - it does not ensure that the function is declared in library headers, nor can it detect functions that are inlined or defined as preprocessor macros. For more robust detection of function availability, prefer using CheckSymbolExists <#module:CheckSymbolExists> or CheckSourceCompiles <#module:CheckSourceCompiles>.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
Checking if the curl library exists in the default paths and has the curl_easy_perform() function:

```
include(CheckLibraryExists)
check_library_exists(curl curl_easy_perform "" HAVE_LIBRARY_CURL)
```

To check if library exists in specific non-standard location and has a specified function:

```
include(CheckLibraryExists)
check_library_exists(curl curl_easy_perform "/opt/curl/lib" HAVE_LIBRARY_CURL)
```

Also Imported Targets <#imported-targets> (for example, from the find_package() call) can be used:

```
find_package(CURL)
# ...
if(TARGET CURL::libcurl)

  include(CheckLibraryExists)

  check_library_exists(CURL::libcurl curl_easy_perform "" HAVE_LIBRARY_CURL)
endif()
```

### See Also
•

The CheckSymbolExists <#module:CheckSymbolExists> module to check whether a C symbol exists.

### CheckLinkerFlag
Added in version 3.18.

This module provides a command to check whether a given link flag is supported by the compiler.

Load this module in a CMake project with:

```
include(CheckLinkerFlag)
```

### Commands
This module provides the following command:

check_linker_flag

Checks once whether the compiler supports a given link flag:

```
check_linker_flag(<lang> <flag> <variable>)
```

This command checks once whether the linker flag <flag> is accepted by the <lang> compiler without producing a diagnostic message.

The arguments are:

<lang>

The language of the compiler used for the check. Supported languages are C, CXX, CUDA, Fortran, HIP, OBJC, OBJCXX, and Swift. Added in version 3.19: Support for CUDA language.

Added in version 3.21: Support for HIP language.

Added in version 3.26: Support for Swift language.

<flag>

Linker flag(s) to check. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>. The underlying implementation uses the LINK_OPTIONS <#prop_tgt:LINK_OPTIONS> target property to test the specified flag. The LINKER: (and SHELL:) prefixes may be used, as described in the Handling Compiler Driver Differences section.

<variable>

The name of the variable to store the check result. This variable will be created as an internal cache variable.

This command temporarily sets the CMAKE_REQUIRED_LINK_OPTIONS variable and calls the check_source_compiles() <#command:check_source_compiles> command from the CheckSourceCompiles <#module:CheckSourceCompiles> module.

A successful result only indicates that the compiler did not report an error when given the link flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Handling Compiler Driver Differences
To pass options to the linker tool, each compiler driver has its own syntax. The LINKER: prefix and , separator can be used to specify, in a portable way, options to pass to the linker tool. LINKER: is replaced by the appropriate driver option and , by the appropriate driver separator. The driver prefix and driver separator are given by the values of the CMAKE_<LANG>_LINKER_WRAPPER_FLAG <#variable:CMAKE_<LANG>_LINKER_WRAPPER_FLAG> and CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP <#variable:CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP> variables.

For example, "LINKER:-z,defs" becomes -Xlinker -z -Xlinker defs for Clang and -Wl,-z,defs for GNU GCC.

The LINKER: prefix can be specified as part of a SHELL: prefix expression.

The LINKER: prefix supports, as an alternative syntax, specification of arguments using the SHELL: prefix and space as separator. The previous example then becomes "LINKER:SHELL:-z defs".

Note:

Specifying the SHELL: prefix anywhere other than at the beginning of the LINKER: prefix is not supported.

### Example: Checking Linker Flag
The following example shows how to use this module to check the -z relro linker flag, which is supported on many Unix-like systems to enable read-only relocations for improved binary security. If the flag is supported by the linker, it is conditionally added to the executable target using the target_link_options() <#command:target_link_options>. The LINKER: prefix is used to pass the flag to the linker in a portable and compiler-independent way.

```
include(CheckLinkerFlag)
check_linker_flag(C "LINKER:-z,relro" HAVE_Z_RELRO)
add_executable(example main.c)
if(HAVE_Z_RELRO)

  target_link_options(example PRIVATE "LINKER:-z,relro")
endif()
```

### Example: Checking Multiple Flags
In the following example, multiple linker flags are checked simultaneously:

```
include(CheckLinkerFlag)
check_linker_flag(C "LINKER:-z,relro;LINKER:-z,now" HAVE_FLAGS)
add_executable(example main.c)
if(HAVE_FLAGS)

  target_link_options(example PRIVATE LINKER:-z,relro LINKER:-z,now)
endif()
```

### See Also

- The CMAKE_LINKER_TYPE <#variable:CMAKE_LINKER_TYPE> variable to specify the linker, which will be used also by this module.

- The CheckCompilerFlag <#module:CheckCompilerFlag> module to check whether a compiler flag is supported.

### CheckOBJCCompilerFlag
Added in version 3.16.

This module provides a command to check whether the Objective-C compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckOBJCCompilerFlag)
```

### Commands
This module provides the following command:

check_objc_compiler_flag

Checks once whether the Objective-C compiler supports a given flag:

```
check_objc_compiler_flag(<flag> <variable>)
```

This command checks once that the <flag> is accepted by the OBJC compiler without producing a diagnostic message. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

The result of the check is stored in the internal cache variable specified by <variable>, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check the Objective-C compiler flag -fobjc-arc. The result of the check is stored in the internal cache variable HAVE_OBJC_ARC, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to OBJC source files.

```
include(CheckOBJCCompilerFlag)
check_objc_compiler_flag(-fobjc-arc HAVE_OBJC_ARC)
if(HAVE_OBJC_ARC)

  target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:OBJC>:-fobjc-arc>

  )
endif()
```

### See Also
•

The CheckCompilerFlag <#module:CheckCompilerFlag> module for a more general command to check whether a compiler flag is supported.

### CheckOBJCSourceCompiles
Added in version 3.16.

This module provides a command to check whether an Objective-C source can be built.

Load this module in a CMake project with:

```
include(CheckOBJCSourceCompiles)
```

### Commands
This module provides the following command:

check_objc_source_compiles

Checks once whether the given Objective-C source code can be built:

```
check_objc_source_compiles(<code> <variable> [FAIL_REGEX <regexes>...])
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable). The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<code>

Source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If this option is provided with one or more regular expressions, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
In the following example, this module is used to check whether the provided Objective-C source code compiles and links. Result of the check is stored in the internal cache variable HAVE_WORKING_CODE.

```
include(CheckOBJCSourceCompiles)
check_objc_source_compiles("

  #import <Foundation/Foundation.h>

  int main()

  {

    NSObject *foo;

    return 0;

  }
" HAVE_WORKING_CODE)
```

### See Also

- The CheckSourceCompiles <#module:CheckSourceCompiles> module for a more general command to check whether source can be built.

- The CheckSourceRuns <#module:CheckSourceRuns> module to check whether source can be built and run.

### CheckOBJCSourceRuns
Added in version 3.16.

This module provides a command to check whether an Objective-C source can be built and run.

Load this module in a CMake project with:

```
include(CheckOBJCSourceRuns)
```

### Commands
This module provides the following command:

check_objc_source_runs

Checks once whether the given Objective-C source code compiles and links into an executable that can subsequently be run:

```
check_objc_source_runs(<code> <variable>)
```

The Objective-C source supplied in <code> must contain at least a main() function. The result of the check is stored in the internal cache variable specified by <variable>. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
In the following example, this module is used to check whether the provided Objective-C source code builds and runs. Result of the check is stored in an internal cache variable HAVE_WORKING_CODE.

```
include(CheckOBJCSourceRuns)
check_objc_source_runs("

  #import <Foundation/Foundation.h>

  int main()

  {

    NSObject *foo;

    return 0;

  }
" HAVE_WORKING_CODE)
```

### See Also

- The CheckSourceRuns <#module:CheckSourceRuns> module for a more general command syntax.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckOBJCXXCompilerFlag
Added in version 3.16.

This module provides a command to check whether the Objective-C++ compiler supports a given flag.

Load this module in a CMake project with:

```
include(CheckOBJCXXCompilerFlag)
```

### Commands
This module provides the following command:

check_objcxx_compiler_flag

Checks once whether the Objective-C++ compiler supports a given flag:

```
check_objcxx_compiler_flag(<flag> <variable>)
```

This command checks once that the <flag> is accepted by the OBJCXX compiler without producing a diagnostic message. Multiple flags can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

The result of the check is stored in the internal cache variable specified by <variable>, with boolean true for success and boolean false for failure.

A successful result only indicates that the compiler did not report an error when given the flag. Whether the flag has any effect, or the intended one, is outside the scope of this module.

Note:

Since the underlying try_compile() <#command:try_compile> command also uses flags from variables like CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, unknown or unsupported flags in those variables may result in a false negative for this check.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
The following example demonstrates how to use this module to check the Objective-C++ compiler flag -fobjc-arc. The result of the check is stored in the internal cache variable HAVE_OBJC_ARC, and the flag is conditionally enabled using the target_compile_options() <#command:target_compile_options> command. The $<COMPILE_LANGUAGE:...> <#genex:COMPILE_LANGUAGE:languages> generator expression ensures that the flag is added only to OBJCXX source files.

```
include(CheckOBJCXXCompilerFlag)
check_objcxx_compiler_flag(-fobjc-arc HAVE_OBJC_ARC)
if(HAVE_OBJC_ARC)
target_compile_options(

    example

    PRIVATE $<$<COMPILE_LANGUAGE:OBJCXX>:-fobjc-arc>

  )
endif()
```

### See Also
•

The CheckCompilerFlag <#module:CheckCompilerFlag> module for a more general command to check whether a compiler flag is supported.

### CheckOBJCXXSourceCompiles
Added in version 3.16.

This module provides a command to check whether an Objective-C++ source can be built.

Load this module in a CMake project with:

```
include(CheckOBJCXXSourceCompiles)
```

### Commands
This module provides the following command:

check_objcxx_source_compiles

Checks once whether the given Objective-C++ source code can be built:

```
check_objcxx_source_compiles(<code> <variable> [FAIL_REGEX <regexes>...])
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable). The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<code>

Objective-C++ source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If this option is provided with one or more regular expressions, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Examples
In the following example, this module is used to check whether the provided Objective-C++ source code can be compiled and linked. Result of the check is stored in the internal cache variable HAVE_WORKING_CODE.

```
include(CheckOBJCXXSourceCompiles)
check_objcxx_source_compiles("

  #include <vector>

  #import <Foundation/Foundation.h>

  int main()

  {

    std::vector<int> v;

    NSObject *foo;

    return 0;

  }
" HAVE_WORKING_CODE)
```

### See Also

- The CheckSourceCompiles <#module:CheckSourceCompiles> module for a more general command to check whether source can be built.

- The CheckSourceRuns <#module:CheckSourceRuns> module to check whether source can be built and run.

### CheckOBJCXXSourceRuns
Added in version 3.16.

This module provides a command to check whether an Objective-C++ source can be built and run.

Load this module in a CMake project with:

```
include(CheckOBJCXXSourceRuns)
```

### Commands
This module provides the following command:

check_objcxx_source_runs

Checks once whether the given Objective-C++ source code compiles and links into an executable that can subsequently be run:

```
check_objcxx_source_runs(<code> <variable>)
```

The Objective-C++ source supplied in <code> must contain at least a main() function. The result of the check is stored in the internal cache variable specified by <variable>. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
In the following example, this module is used to check whether the provided Objective-C++ source code builds and runs. Result of the check is stored in an internal cache variable HAVE_WORKING_CODE.

```
include(CheckOBJCXXSourceRuns)
check_objcxx_source_runs("

  #include <vector>

  #import <Foundation/Foundation.h>

  int main()

  {

    std::vector<int> v;

    NSObject *foo;

    return 0;

  }
" HAVE_WORKING_CODE)
```

### See Also

- The CheckSourceRuns <#module:CheckSourceRuns> module for a more general command syntax.

- The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckPIESupported
Added in version 3.14.

This module provides a command to check whether the linker supports Position Independent Code (PIE) or No Position Independent Code (NO_PIE) for executables.

Load this module in a CMake project with:

```
include(CheckPIESupported)
```

When setting the POSITION_INDEPENDENT_CODE <#prop_tgt:POSITION_INDEPENDENT_CODE> target property, PIC-related compile and link options are added when building library objects, and PIE-related compile options are added when building objects of executable targets, regardless of this module. Use this module to ensure that the POSITION_INDEPENDENT_CODE target property for executables is also honored at link time.

### Commands
This module provides the following command:

check_pie_supported

Checks for PIE/NO_PIE support and prepares all executables to have link time PIE options enabled:

```
check_pie_supported([OUTPUT_VARIABLE <output>] [LANGUAGES <langs>...])
```

Options are:

OUTPUT_VARIABLE <output>

Set <output> variable with details about any error. If the check is bypassed because it uses cached results from a previous call, the output will be empty even if errors were present in the previous call.

LANGUAGES <langs>...

Check the linkers used for each of the specified languages. If this option is not provided, the command checks all enabled languages. C, CXX, Fortran are supported.

Added in version 3.23: OBJC, OBJCXX, CUDA, and HIP are supported.

Note:

To use check_pie_supported(), policy CMP0083 <#policy:CMP0083> must be set to NEW; otherwise, a fatal error will occur.

### Variables
For each language checked, the check_pie_supported() command defines two boolean cache variables:

CMAKE_<lang>_LINK_PIE_SUPPORTED

Set to true if PIE is supported by the linker and false otherwise.

CMAKE_<lang>_LINK_NO_PIE_SUPPORTED

Set to true if NO_PIE is supported by the linker and false otherwise.

### Examples
To enable PIE on an executable target at link time as well, include this module and call check_pie_supported() before setting the POSITION_INDEPENDENT_CODE target property. This will determine whether the linker for each checked language supports PIE-related link options. For example:

```
add_executable(foo ...)
include(CheckPIESupported)
check_pie_supported()
set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
```

Since not all linkers require or support PIE-related link options (for example, MSVC), retrieving any error messages might be useful for logging purposes:

```
add_executable(foo ...)
message(CHECK_START "Checking for C linker PIE support")
include(CheckPIESupported)
check_pie_supported(OUTPUT_VARIABLE output LANGUAGES C)
set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
if(CMAKE_C_LINK_PIE_SUPPORTED)

  message(CHECK_PASS "yes")
else()

  message(CHECK_FAIL "no")

  message(VERBOSE "PIE is not supported at link time:\n${output}"

                  "PIE link options will not be passed to linker.")
endif()
```

Setting the POSITION_INDEPENDENT_CODE target property on an executable without this module will set PIE-related compile options but not PIE-related link options, which might not be sufficient in certain cases:

```
add_executable(foo ...)
set_property(TARGET foo PROPERTY POSITION_INDEPENDENT_CODE TRUE)
```

### CheckPrototypeDefinition
This module provides a command to check if a C function has the expected prototype.

Load this module in a CMake project with:

```
include(CheckPrototypeDefinition)
```

### Commands
This module provides the following command:

check_prototype_definition

Checks if a C function has the expected prototype:

```
check_prototype_definition(<function> <prototype> <return> <headers> <variable>)
```

<function>

The name of the function whose prototype is being checked.

<prototype>

The expected prototype of the function, provided as a string.

<return>

The return value of the function. This will be used as a return value in the function definition body of the generated test program to verify that the function's return type matches the expected type.

<headers>

A semicolon-separated list <#cmake-language-lists> of header file names required for checking the function prototype.

<variable>

The name of the variable to store the check result. This variable will be created as an internal cache variable.

This command generates a test program and verifies that it builds without errors. The generated test program includes specified <headers>, defines a function with given literal <prototype> and <return> value and then uses the specified <function>. The simplified test program can be illustrated as:

```
#include <headers>
// ...
<prototype> { return <return>; }
int main(...) { ...<function>()... }
```

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
Checking if the getpwent_r() function on Solaris/illumos systems has the expected prototype:

```
include(CheckPrototypeDefinition)
check_prototype_definition(

  getpwent_r

  "struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"

  "NULL"

  "unistd.h;pwd.h"

  HAVE_SOLARIS_GETPWENT_R
)
```

### CheckSourceCompiles
Added in version 3.19.

This module provides a command that checks whether a source code can be built for a given language.

Load this module in a CMake project with:

```
include(CheckSourceCompiles)
```

### Commands
This module provides the following command:

check_source_compiles

Checks once whether the given source code can be built for the given language:

```
check_source_compiles(

  <lang>

  <code>

  <variable>

  [FAIL_REGEX <regexes>...]

  [SRC_EXT <extension>]
)
```

This command checks once that the source supplied in <code> can be compiled (and linked into an executable) for code language <lang>. The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<lang>

Language of the source code to check. Supported languages are: C, CXX, CUDA, Fortran, HIP, ISPC, OBJC, OBJCXX, and Swift. Added in version 3.21: Support for HIP language.

Added in version 3.26: Support for Swift language.

<code>

The source code to check. This must be an entire program, as written in a file containing the body block. All symbols used in the source code are expected to be declared as usual in their corresponding headers.

<variable>

Variable name of an internal cache variable to store the result of the check, with boolean true for success and boolean false for failure.

FAIL_REGEX <regexes>...

If one or more regular expression patterns are provided, then failure is determined by checking if anything in the compiler output matches any of the specified regular expressions.

SRC_EXT <extension>

By default, the internal test source file used for the check will be given a file extension that matches the requested language (e.g., .c for C, .cxx for C++, .F90 for Fortran, etc.). This option can be used to override this with the .<extension> instead.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE>

Internally, the try_compile() <#command:try_compile> command is used to perform the check, and this variable controls the type of target it creates. If this variable is set to EXECUTABLE (the default), the check compiles and links the test source code as an executable program. If set to STATIC_LIBRARY, the test source code is compiled but not linked.

### Example: Basic Usage
The following example demonstrates how to check whether the C++ compiler supports a specific language feature using this module. In this case, the check verifies if the compiler supports C++11 lambda expressions. The result is stored in the internal cache variable HAVE_CXX11_LAMBDAS:

```
include(CheckSourceCompiles)
check_source_compiles(CXX [[

  int main()

  {

    auto lambda = []() { return 42; };

    return lambda();

  }
]] HAVE_CXX11_LAMBDAS)
```

### Example: Checking Code With Bracket Argument
The following example shows how to check whether the C compiler supports the noreturn attribute. Code is supplied using the Bracket Argument <#bracket-argument> for easier embedded quotes handling:

```
include(CheckSourceCompiles)
check_source_compiles(C [[

  #if !__has_c_attribute(noreturn)

  #  error "No noreturn attribute"

  #endif

  int main(void) { return 0; }
]] HAVE_NORETURN)
```

### Example: Performing a Check Without Linking
In the following example, this module is used to perform a compile-only check of Fortran source code, whether the compiler supports the pure procedure attribute:

```
include(CheckSourceCompiles)
block()

  set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")

  check_source_compiles(

    Fortran

    "pure subroutine foo()

    end subroutine"

    HAVE_PURE

  )
endblock()
```

### Example: Isolated Check
In the following example, this module is used in combination with the CMakePushCheckState <#module:CMakePushCheckState> module to modify required libraries when checking whether the PostgreSQL PGVerbosity enum contains PQERRORS_SQLSTATE (available as of PostgreSQL version 12):

```
include(CheckSourceCompiles)
include(CMakePushCheckState)
find_package(PostgreSQL)
if(TARGET PostgreSQL::PostgreSQL)

  cmake_push_check_state(RESET)

    set(CMAKE_REQUIRED_LIBRARIES PostgreSQL::PostgreSQL)

    check_source_compiles(C [[

      #include <libpq-fe.h>

      int main(void)

      {

        PGVerbosity e = PQERRORS_SQLSTATE;

        (void)e;

        return 0;

      }

    ]] HAVE_PQERRORS_SQLSTATE)

  cmake_pop_check_state()
endif()
```

### See Also
•

The CheckSourceRuns <#module:CheckSourceRuns> module to check whether the source code can be built and also run.

### CheckSourceRuns
Added in version 3.19.

This module provides a command to check whether a source code can be built and run.

Load this module in a CMake project with:

```
include(CheckSourceRuns)
```

### Commands
This module provides the following command:

check_source_runs

Checks once whether the given source code compiles and links into an executable that can subsequently be run:

```
check_source_runs(<lang> <code> <variable> [SRC_EXT <extension>])
```

This command checks once that the <lang> source code supplied in <code> can be built, linked as an executable, and then run. The result of the check is stored in the internal cache variable specified by <variable>.

The arguments are:

<lang>

The programming language of the source <code> to check. Supported languages are: C, CXX, CUDA, Fortran, HIP, OBJC, and OBJCXX. Added in version 3.21: Support for HIP language.

<code>

The source code to be tested. It must contain a valid source program. For example, it must contain at least a main() function (in C/C++), or a program unit (in Fortran).

<variable>

Name of the internal cache variable with the result of the check. If the code builds and runs with exit code 0, success is indicated by a boolean true value. Failure to build or run is indicated by a boolean false value, such as an empty string or an error message.

SRC_EXT <extension>

By default, the internal test source file used for the check will be given a file extension that matches the requested language (e.g., .c for C, .cxx for C++, .F90 for Fortran, etc.). This option can be used to override this with the .<extension> instead.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Example: Basic Usage
The following example demonstrates how to use this module to check whether the C source code is supported and operational at runtime. The result of the check is stored in the internal cache variable HAVE_NORETURN.

```
include(CheckSourceRuns)
check_source_runs(C [[

  #include <stdlib.h>

  #include <stdnoreturn.h>

  noreturn void f(){ exit(0); }

  int main(void) { f(); return 1; }
]] HAVE_NORETURN)
```

### Example: Checking Fortran Code
Checking if Fortran source code runs successfully:

```
include(CheckSourceRuns)
check_source_runs(Fortran [[

  program test

  real :: x[*]

  call co_sum(x)

  end program
]] HAVE_COARRAY)
```

### Example: Checking C++ Code With Bracket Argument
The following example demonstrates how to check whether the C++ standard library is functional and std::vector works at runtime. If the source compiles, links, and runs successfully, internal cache variable HAVE_WORKING_STD_VECTOR will be set to boolean true value. Code is supplied using Bracket Argument <#bracket-argument> for easier embedded quotes handling:

```
include(CheckSourceRuns)
check_source_runs(CXX [[

  #include <iostream>

  #include <vector>

  int main()

  {

    std::vector<int> v = {1, 2, 3};

    if (v.size() != 3) return 1;

    std::cout << "Vector works correctly." << std::endl;

    return 0;

  }
]] HAVE_WORKING_STD_VECTOR)
```

### Example: Isolated Check
In the following example, this module is used in combination with the CMakePushCheckState <#module:CMakePushCheckState> module to modify required compile definitions and libraries when checking whether the C function sched_getcpu() is supported and operational at runtime. For example, on some systems, the sched_getcpu() function may be available at compile time but not actually implemented by the kernel. In such cases, it returns -1 and sets errno to ENOSYS. This check verifies that sched_getcpu() runs successfully and stores a boolean result in the internal cache variable HAVE_SCHED_GETCPU.

```
include(CheckSourceRuns)
include(CMakePushCheckState)
cmake_push_check_state(RESET)

  set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)

  if(CMAKE_SYSTEM_NAME STREQUAL "Haiku")

    set(CMAKE_REQUIRED_LIBRARIES gnu)

  endif()

  check_source_runs(C [[

    #include <sched.h>

    int main(void)

    {

      if (sched_getcpu() == -1) {

        return 1;

      }

      return 0;

    }

  ]] HAVE_SCHED_GETCPU)
cmake_pop_check_state()
```

### See Also
•

The CheckSourceCompiles <#module:CheckSourceCompiles> module to check whether a source code can be built.

### CheckStructHasMember
This module provides a command to check whether a struct or class has a specified member variable.

Load this module in a CMake project with:

```
include(CheckStructHasMember)
```

### Commands
This module provides the following command:

check_struct_has_member

Checks once if the given struct or class has the specified member variable:

```
check_struct_has_member(

  <struct>

  <member>

  <headers>

  <variable>

  [LANGUAGE <language>]
)
```

This command checks once whether the struct or class <struct> contains the specified <member> after including the given header(s) <headers> where the prototype should be declared. Multiple header files can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>. The result is stored in an internal cache variable <variable>.

The options are:

LANGUAGE <language>

Use the <language> compiler to perform the check. Acceptable values are C and CXX. If not specified, it defaults to C.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Example: Checking C Struct Member
In the following example, this module checks if the C struct timeval has a member variable tv_sec after including the <sys/select.h> header. The result of the check is stored in the internal cache variable HAVE_TIMEVAL_TV_SEC.

```
include(CheckStructHasMember)
check_struct_has_member(

  "struct timeval"

  tv_sec

  sys/select.h

  HAVE_TIMEVAL_TV_SEC
)
```

### Example: Checking C++ Struct Member
In the following example, this module checks if the C++ struct std::tm has a member variable tm_gmtoff after including the <ctime> header. The result of the check is stored in the internal cache variable HAVE_TM_GMTOFF.

```
include(CheckStructHasMember)
check_struct_has_member(

  std::tm

  tm_gmtoff

  ctime

  HAVE_TM_GMTOFF

  LANGUAGE CXX
)
```

### Example: Isolated Check With Compile Definitions
In the following example, the check is performed with temporarily modified compile definitions using the CMakePushCheckState <#module:CMakePushCheckState> module:

```
include(CheckStructHasMember)
include(CMakePushCheckState)
cmake_push_check_state(RESET)

  set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)

  check_struct_has_member(

    "struct utsname"

    domainname

    sys/utsname.h

    HAVE_UTSNAME_DOMAINNAME

  )
cmake_pop_check_state()
```

### CheckSymbolExists
This module provides a command to check whether a C symbol exists.

Load this module in a CMake project with:

```
include(CheckSymbolExists)
```

### Commands
This module provides the following command:

check_symbol_exists

Checks once whether a symbol exists as a function, variable, or preprocessor macro in C:

```
check_symbol_exists(<symbol> <headers> <variable>)
```

This command checks whether the <symbol> is available after including the specified header file(s) <headers>, and stores the result in the internal cache variable <variable>. Multiple header files can be specified in one argument as a string using a semicolon-separated list <#cmake-language-lists>.

If the header files define the symbol as a macro, it is considered available and assumed to work. If the symbol is declared as a function or variable, the check also ensures that it links successfully (i.e., the symbol must exist in a linked library or object file). Compiler intrinsics may not be detected, as they are not always linkable or explicitly declared in headers.

Symbols that are types, enum values, or compiler intrinsics are not recognized. For those, consider using the CheckTypeSize <#module:CheckTypeSize> or CheckSourceCompiles <#module:CheckSourceCompiles> module instead.

This command is intended to check symbols as they appear in C. For C++ symbols, use the CheckCXXSymbolExists <#module:CheckCXXSymbolExists> module instead.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Examples
The following example demonstrates how to check for the presence of a preprocessor macro SEEK_SET and the C function fopen() from the <stdio.h> header using this module:

```
include(CheckSymbolExists)
# Check for macro SEEK_SET
check_symbol_exists(SEEK_SET "stdio.h" HAVE_SEEK_SET)
# Check for function fopen
check_symbol_exists(fopen "stdio.h" HAVE_FOPEN)
```

### See Also
•

The CheckCXXSymbolExists <#module:CheckCXXSymbolExists> module to check whether a C++ symbol exists.

### CheckTypeSize
This module provides a command to check the size of a C/C++ type or expression.

Load this module in a CMake project with:

```
include(CheckTypeSize)
```

### Commands
This module provides the following command:

check_type_size

Checks once whether the C/C++ type or expression exists and determines its size:

```
check_type_size(

  <type>

  <size-var>

  [RESULT_VARIABLE <result-var>]

  [BUILTIN_TYPES_ONLY]

  [LANGUAGE <language>]
)
```

The arguments are:

<type>

The type or expression being checked.

<size-var>

The name of the internal cache variable for storing the size of the type or expression <type>. This name is also used as a prefix as explained below.

RESULT_VARIABLE <result-var>

Added in version 4.2.

The name of the internal cache variable that holds a boolean value indicating whether the type or expression <type> exists. If not given, the command will by default define an internal cache variable named HAVE_<size-var> instead.

BUILTIN_TYPES_ONLY

If given, only compiler-builtin types will be supported in the check. If not given, the command checks for common headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H internal cache variables. For C++ std:: types, <cstdint> and <cstddef> are also checked with HAVE_CSTDINT and HAVE_CSTDDEF defined respectively. The command automatically includes the available headers in the type size check, thus supporting checks of types defined in the headers.

LANGUAGE <language>

Uses the <language> compiler to perform the check. Acceptable values are C and CXX. If not specified, it defaults to C.

Result Variables

Results are reported in the following variables:

<size-var>

Internal cache variable that holds one of the following values:

<size>

If the type or expression <type> exists, it will have a non-zero size <size> in bytes.

0

When the type has an architecture-dependent size; This may occur when CMAKE_OSX_ARCHITECTURES <#variable:CMAKE_OSX_ARCHITECTURES> has multiple architectures. In this case also the <size-var>_KEYS variable is defined and the <size-var>_CODE variable contains preprocessor tests mapping as explained below.

"" (empty string)

When the type or expression <type> does not exist.

HAVE_<size-var>

Internal cache variable that holds a boolean value indicating whether the type or expression <type> exists. This variable is defined when the RESULT_VARIABLE argument is not used.

<result-var>

Added in version 4.2.

Internal cache variable defined when the RESULT_VARIABLE argument is used. It holds a boolean value indicating whether the type or expression <type> exists (same value as HAVE_<size-var>). In this case, the HAVE_<size-var> variable is not defined.

<size-var>_CODE

CMake variable that holds preprocessor code to define the macro <size-var> to the size of the type, or to leave the macro undefined if the type does not exist. When the type has an architecture-dependent size (<size-var> value is 0) this variable contains preprocessor tests mapping from each architecture macro to the corresponding type size.

<size-var>_KEYS

CMake variable that is defined only when the type has an architecture-dependent size (<size-var> value is 0) and contains a list of architecture macros. The value for each key is stored in <size-var>-<key> variables.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_EXTRA_INCLUDE_FILES

A semicolon-separated list <#cmake-language-lists> of extra header files to include when performing the check.

### Examples
Consider the code:

```
include(CheckTypeSize)
# Check for size of long.
check_type_size(long SIZEOF_LONG)
message("HAVE_SIZEOF_LONG: ${HAVE_SIZEOF_LONG}")
message("SIZEOF_LONG: ${SIZEOF_LONG}")
message("SIZEOF_LONG_CODE: ${SIZEOF_LONG_CODE}")
```

On a 64-bit architecture, the output may look something like this:

```
HAVE_SIZEOF_LONG: TRUE
SIZEOF_LONG: 8
SIZEOF_LONG_CODE: #define SIZEOF_LONG 8
```

On Apple platforms, when CMAKE_OSX_ARCHITECTURES <#variable:CMAKE_OSX_ARCHITECTURES> has multiple architectures, types may have architecture-dependent sizes. For example, with the code:

```
include(CheckTypeSize)
check_type_size(long SIZEOF_LONG)
message("HAVE_SIZEOF_LONG: ${HAVE_SIZEOF_LONG}")
message("SIZEOF_LONG: ${SIZEOF_LONG}")
foreach(key IN LISTS SIZEOF_LONG_KEYS)

  message("key: ${key}")

  message("value: ${SIZEOF_LONG-${key}}")
endforeach()
message("SIZEOF_LONG_CODE:\n${SIZEOF_LONG_CODE}")
```

the result may be:

```
HAVE_SIZEOF_LONG: TRUE
SIZEOF_LONG: 0
key: __i386
value: 4
key: __x86_64
value: 8
SIZEOF_LONG_CODE:
#if defined(__i386)
# define SIZEOF_LONG 4
#elif defined(__x86_64)
# define SIZEOF_LONG 8
#else
# error SIZEOF_LONG unknown
#endif
```

### Example: Configuration Header
The next example demonstrates how the result variables can be used in a configuration header:

```
include(CheckTypeSize)
check_type_size(long SIZEOF_LONG)
configure_file(config.h.in config.h @ONLY)
```

config.h.in

```
/* Define whether the type 'long' exists. */
#cmakedefine HAVE_SIZEOF_LONG
/* The size of 'long', as computed by sizeof. */
@SIZEOF_LONG_CODE@
```

### Example: Checking Complex Expressions
Despite the name of this module, it may also be used to determine the size of more complex expressions. For example, to check the size of a struct member:

```
include(CheckTypeSize)
check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
```

### Example: Isolated Check
In the following example, the check is performed with temporarily modified additional headers using the CMAKE_EXTRA_INCLUDE_FILES variable and CMakePushCheckState <#module:CMakePushCheckState> module. The result of the check is stored in HAVE_SIZEOF_UNION_SEMUN, and size is stored in SIZEOF_UNION_SEMUN internal cache variables.

```
include(CheckTypeSize)
include(CMakePushCheckState)
cmake_push_check_state(RESET)

  set(CMAKE_EXTRA_INCLUDE_FILES sys/types.h sys/ipc.h sys/sem.h)

  check_type_size("union semun" SIZEOF_UNION_SEMUN)
cmake_pop_check_state()
```

### Example: Customizing Result Variable
Since CMake 4.2, the HAVE_<size-var> variable name can be customized using the RESULT_VARIABLE argument. In the following example, this module is used to check whether the struct flock exists, and the result is stored in the MyProj_HAVE_STRUCT_FLOCK internal cache variable:

```
cmake_minimum_required(VERSION 4.2)
# ...
include(CheckTypeSize)
include(CMakePushCheckState)
cmake_push_check_state(RESET)

  set(CMAKE_EXTRA_INCLUDE_FILES "fcntl.h")

  check_type_size(

    "struct flock"

    MyProj_SIZEOF_STRUCT_FLOCK

    RESULT_VARIABLE MyProj_HAVE_STRUCT_FLOCK

  )
cmake_pop_check_state()
```

### CheckVariableExists
This module provides a command to check whether a C variable exists.

Load this module in a CMake project with:

```
include(CheckVariableExists)
```

### Commands
This module provides the following command:

check_variable_exists

Checks once if a C variable exists:

```
check_variable_exists(<var> <variable>)
```

This command attempts to compile and link a test C program that references the specified C variable <var>. A boolean result of whether the check was successful is stored in an internal cache variable <variable>.

Note:

Prefer using CheckSymbolExists <#module:CheckSymbolExists> or CheckSourceCompiles <#module:CheckSourceCompiles> instead of this command for more robust detection. This command performs a link-only check and doesn't detect whether a variable is also declared in system or library headers. Neither can it detect variables that might be defined as preprocessor macros.

Variables Affecting the Check

The following variables may be set before calling this command to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

### Example: Basic Usage
In the following example, a check is performed whether the linker sees the C variable tzname and stores the check result in the PROJECT_HAVE_TZNAME internal cache variable:

```
include(CheckVariableExists)
check_variable_exists(tzname PROJECT_HAVE_TZNAME)
```

### Example: Isolated Check With Linked Libraries
In the following example, this module is used in combination with the CMakePushCheckState <#module:CMakePushCheckState> module to link additional required library using the CMAKE_REQUIRED_LIBRARIES variable. For example, in a find module, to check whether the Net-SNMP library has the usmHMAC192SHA256AuthProtocol array:

```
include(CheckVariableExists)
include(CMakePushCheckState)
find_library(SNMP_LIBRARY NAMES netsnmp)
if(SNMP_LIBRARY)

  cmake_push_check_state(RESET)

  set(CMAKE_REQUIRED_LIBRARIES ${SNMP_LIBRARY})

  check_variable_exists(usmHMAC192SHA256AuthProtocol SNMP_HAVE_SHA256)

  cmake_pop_check_state()
endif()
```

### See Also
•

The CheckSymbolExists <#module:CheckSymbolExists> module to check whether a C symbol exists.

### CMakeAddFortranSubdirectory
This module provides a command to add a Fortran project located in a subdirectory.

Load this module in a CMake project with:

```
include(CMakeAddFortranSubdirectory)
```

### Commands
This module provides the following command:

cmake_add_fortran_subdirectory

Adds a Fortran-only subproject from subdirectory to the current project:

```
cmake_add_fortran_subdirectory(

  <subdir>

  PROJECT <project-name>

  ARCHIVE_DIR <dir>

  RUNTIME_DIR <dir>

  LIBRARIES <libs>...

  LINK_LIBRARIES

    [LINK_LIBS <lib> <deps>...]...

  [CMAKE_COMMAND_LINE <flags>...]

  NO_EXTERNAL_INSTALL
)
```

This command checks whether the current compiler supports Fortran or attempts to locate a Fortran compiler. If a compatible Fortran compiler is found, the Fortran project located in <subdir> is added as a subdirectory to the current project.

If no Fortran compiler is found and the compiler is MSVC, it searches for the MinGW gfortran compiler. In this case, the Fortran project is built as an external project using MinGW tools, and Fortran-related imported targets are created. This setup works only if the Fortran code is built as a shared DLL library, so the BUILD_SHARED_LIBS <#variable:BUILD_SHARED_LIBS> variable is enabled in the external project. Additionally, the CMAKE_GNUtoMS <#variable:CMAKE_GNUtoMS> variable is set to ON to ensure that Microsoft-compatible .lib files are created.

The options are:

PROJECT

The name of the Fortran project as defined in the top-level CMakeLists.txt located in <subdir>.

ARCHIVE_DIR

Directory where the project places .lib archive files. A relative path is interpreted as relative to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>.

RUNTIME_DIR

Directory where the project places .dll runtime files. A relative path is interpreted as relative to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>.

LIBRARIES

Names of library targets to create or import into the current project.

LINK_LIBRARIES

Specifies link interface libraries for LIBRARIES. This option expects a list of LINK_LIBS <lib> <deps>... items, where:

- LINK_LIBS marks the start of a new pair

- <lib> is a library target.

- <deps>... represents one or more dependencies required by <lib>.

CMAKE_COMMAND_LINE

Additional command-line flags passed to cmake(1) <#manual:cmake(1)> command when configuring the Fortran subproject.

NO_EXTERNAL_INSTALL

Prevents installation of the external project. Note:

The NO_EXTERNAL_INSTALL option is required for forward compatibility with a future version that supports installation of the external project binaries during make install.

### Examples
Adding a Fortran subdirectory to a project can be done by including this module and calling the cmake_add_fortran_subdirectory() command. In the following example, a Fortran project provides the hello library and its dependent world library:

```
include(CMakeAddFortranSubdirectory)
cmake_add_fortran_subdirectory(

  fortran-subdir

  PROJECT FortranHelloWorld

  ARCHIVE_DIR lib

  RUNTIME_DIR bin

  LIBRARIES hello world

  LINK_LIBRARIES

    LINK_LIBS hello world # hello library depends on the world library

  NO_EXTERNAL_INSTALL
)
# The Fortran target can be then linked to the main project target.
add_executable(main main.c)
target_link_libraries(main PRIVATE hello)
```

### See Also
There are multiple ways to integrate Fortran libraries. Alternative approaches include:

- The add_subdirectory() <#command:add_subdirectory> command to add the subdirectory directly to the build.

- The export() <#command:export> command can be used in the subproject to provide Imported Targets <#imported-targets> or similar for integration with other projects.

- The FetchContent <#module:FetchContent> or ExternalProject <#module:ExternalProject> modules when working with external dependencies.

### CMakeBackwardCompatibilityCXX
This module defines several backward compatibility cache variables for the CXX language to support early C++ (pre-C++98, ANSI C++).

Load this module in a CMake project with:

```
include(CMakeBackwardCompatibilityCXX)
```

The following modules are included by this module:

- TestForANSIForScope <#module:TestForANSIForScope>

- TestForANSIStreamHeaders <#module:TestForANSIStreamHeaders>

- TestForSSTREAM <#module:TestForSSTREAM>

- TestForSTDNamespace <#module:TestForSTDNamespace>

Additionally, the following cache variable may be defined:

CMAKE_ANSI_CXXFLAGS

A space-separated string of compiler options for enabling ANSI C++ mode, if available.

Note:

This module is intended for C++ code written before C++ 98. As of the C++ 98 standard, these issues have been formally addressed, making such checks obsolete.

### Examples
Including this module provides backward compatibility cache variables, which can be used in C++. For example:

CMakeLists.txt

```
include(CMakeBackwardCompatibilityCXX)
file(

  CONFIGURE

  OUTPUT config.h

  CONTENT [[

    #cmakedefine CMAKE_NO_ANSI_FOR_SCOPE

    #cmakedefine CMAKE_NO_ANSI_STRING_STREAM

    #cmakedefine CMAKE_NO_ANSI_STREAM_HEADERS

    #cmakedefine CMAKE_NO_STD_NAMESPACE

  ]]
)
```

### CMakeDependentOption
This module provides a command to define boolean options whose availability and default values depend on specified conditions or other options. This helps maintain a clean configuration interface by only displaying options that are relevant to the current settings.

Load this module in CMake with:

```
include(CMakeDependentOption)
```

### Commands
This module provides the following command:

cmake_dependent_option

Provides a boolean option that depends on a set of conditions:

```
cmake_dependent_option(<variable> <help> <value> <condition> <else-value>)
```

This command creates a boolean <variable> and makes it available to the user in the GUI (such as cmake-gui(1) <#manual:cmake-gui(1)> or ccmake(1) <#manual:ccmake(1)>), if a set of conditions evaluates to boolean true.

The arguments are:

<variable>

The name of a variable that stores the option value.

<help>

A brief description of the option. This string is typically a short line of text and is displayed in the GUI.

<value>

Boolean value for the <variable>, when <condition> evaluates to boolean true.

<condition>

Specifies the conditions that determine whether <variable> is set and visible in the GUI.

- If <condition> evaluates to boolean false, option is hidden from the user in the GUI, and a local variable <variable> is set to <else-value>.

- If <condition> evaluates to boolean true, a boolean cache variable named <variable> is created with default <value>, and option is shown in the GUI, allowing the user to enable or disable it.

- If <condition> later evaluates to boolean false (on consecutive configuration run), option is hidden from the user in the GUI and the <variable> type is changed to an internal cache variable. In that case a local variable of the same name is set to <else-value>.

- If <condition> becomes true again in consecutive configuration runs, the user's previously set value is preserved.

The <condition> argument can be:

- A single condition (such as a variable name).

- A semicolon-separated list <#cmake-language-lists> of multiple conditions.

- Added in version 3.22: A full Condition Syntax <#condition-syntax> as used in an if(<condition>) clause. See policy CMP0127 <#policy:CMP0127>. This enables using entire condition syntax (such as grouping conditions with parens and similar).

<else-value>

The value assigned to a local variable named <variable>, when <condition> evaluates to boolean false.

In CMake project mode, boolean cache variables are created as explained above. In CMake script mode, boolean variables are set instead.

### Example: Basic Usage
Using this module in a project to conditionally set an option:

CMakeLists.txt

```
include(CMakeDependentOption)
cmake_dependent_option(USE_SSL_GNUTLS "Use GnuTLS for SSL" ON USE_SSL OFF)
```

### Example: Enabling/Disabling Dependent Option
Extending the previous example, this demonstrates how the module allows user-configurable options based on a condition during the configuration phase:

CMakeLists.txt

```
include(CMakeDependentOption)
option(USE_SSL "Enable SSL in the project" OFF)
cmake_dependent_option(USE_SSL_GNUTLS "Use GnuTLS for SSL" ON USE_SSL OFF)
message(STATUS "USE_SSL: ${USE_SSL}")
message(STATUS "USE_SSL_GNUTLS: ${USE_SSL_GNUTLS}")
```

On the first configuration run, a boolean cache variable USE_SSL is set to OFF, and a local variable USE_SSL_GNUTLS is set to OFF:

```
$ cmake -B build-dir
-- USE_SSL: OFF
-- USE_SSL_GNUTLS: OFF
```

Running CMake with USE_SSL=ON sets both USE_SSL and USE_SSL_GNUTLS boolean cache variables to ON:

```
$ cmake -B build-dir -D USE_SSL=ON
-- USE_SSL: ON
-- USE_SSL_GNUTLS: ON
```

On a subsequent configuration run with USE_SSL=OFF, USE_SSL_GNUTLS follows suit. However, its value is preserved in the internal cache while being overridden locally:

```
$ cmake -B build-dir -D USE_SSL=OFF
-- USE_SSL: OFF
-- USE_SSL_GNUTLS: OFF
```

### Example: Semicolon-separated List of Conditions
The <condition> argument can also be a semicolon-separated list of conditions. In the following example, if the variable USE_BAR is ON and variable USE_ZOT is OFF, the option USE_FOO is available and defaults to ON. Otherwise, USE_FOO is set to OFF and hidden from the user.

If the values of USE_BAR or USE_ZOT change in the future configuration runs, the previous value of USE_FOO is preserved so that when it becomes available again, it retains its last set value.

CMakeLists.txt

```
include(CMakeDependentOption)
cmake_dependent_option(USE_FOO "Use Foo" ON "USE_BAR;NOT USE_ZOT" OFF)
```

### Example: Full Condition Syntax
As of CMake 3.22, cmake_dependent_option() supports full condition syntax.

In fhe following example, if the condition evaluates to true, the option USE_FOO is available and set to ON. Otherwise, it is set to OFF and hidden in the GUI. The value of USE_FOO is preserved across configuration runs, similar to the previous example.

CMakeLists.txt

```
include(CMakeDependentOption)
cmake_dependent_option(USE_FOO "Use Foo" ON "USE_A AND (USE_B OR USE_C)" OFF)
```

Another example demonstrates how an option can be conditionally available based on the target system:

CMakeLists.txt

```
include(CMakeDependentOption)
cmake_dependent_option(

  ENABLE_FOO

  "Enable feature Foo (this option is available when building for Windows)"

  ON

  [[CMAKE_SYSTEM_NAME STREQUAL "Windows"]]

  OFF
)
```

### See Also
•

The option() <#command:option> command to provide a boolean option that the user can optionally select.

### CMakeFindDependencyMacro
This module provides a command implemented as a macro that finds dependency for a package.

Load this module in a CMake package configuration file with:

FooConfig.cmake or foo-config.cmake:

```
include(CMakeFindDependencyMacro)
```

Note:

This module is designed to be used in a Package Configuration File <#config-file-packages> (<PackageName>Config.cmake).

### Commands
This module provides the following command:

find_dependency

The find_dependency() macro wraps a find_package() <#command:find_package> call for a package dependency:

```
find_dependency(<dep> [...])
```

It is designed to be used in a Package Configuration File <#config-file-packages> (<PackageName>Config.cmake). find_dependency forwards the correct parameters for QUIET and REQUIRED which were passed to the original find_package() <#command:find_package> call. Any additional arguments specified are forwarded to find_package() <#command:find_package>.

If the dependency could not be found it sets an informative diagnostic message and calls return() <#command:return> to end processing of the calling package configuration file and return to the find_package() <#command:find_package> command that loaded it.

Note:

The call to return() <#command:return> makes this macro unsuitable to call from Find Modules <#find-modules>.

### Package Dependency Search Optimizations
If find_dependency is called with arguments identical to a previous call in the same directory, perhaps due to diamond-shaped package dependencies, the underlying call to find_package() <#command:find_package> is optimized out. This optimization is important to support large package dependency graphs while avoiding a combinatorial explosion of repeated searches. However, the heuristic cannot account for ambient variables that affect package behavior, such as <PackageName>_USE_STATIC_LIBS, offered by some packages. Therefore package configuration files should avoid setting such variables before their calls to find_dependency.

Changed in version 3.15: Previously, the underlying call to find_package() <#command:find_package> was always optimized out if the package had already been found. CMake 3.15 removed the optimization to support cases in which find_dependency call arguments request different components.

Changed in version 3.26: The pre-3.15 optimization was restored, but with the above-described heuristic to account for varying find_dependency call arguments.

### CMakePackageConfigHelpers
This module provides helper commands for creating config files <#libraries-providing-config-file-packages> that can be included by other projects to find and use a package.

Load this module in a CMake project with:

```
include(CMakePackageConfigHelpers)
```

### Generating a Package Configuration File
configure_package_config_file

Create a config file for a project:

```
configure_package_config_file(<input> <output>

  INSTALL_DESTINATION <path>

  [PATH_VARS <var1> <var2> ... <varN>]

  [NO_SET_AND_CHECK_MACRO]

  [NO_CHECK_REQUIRED_COMPONENTS_MACRO]

  [INSTALL_PREFIX <path>]

  )
```

configure_package_config_file() should be used instead of the plain configure_file() <#command:configure_file> command when creating the <PackageName>Config.cmake or <PackageName>-config.cmake file for installing a project or library. It helps make the resulting package relocatable by avoiding hardcoded paths in the installed <PackageName>Config.cmake file.

In a FooConfig.cmake file there may be code like this to make the install destinations known to the using project:

```
set(FOO_INCLUDE_DIR   "@CMAKE_INSTALL_FULL_INCLUDEDIR@" )
set(FOO_DATA_DIR   "@CMAKE_INSTALL_PREFIX@/@RELATIVE_DATA_INSTALL_DIR@" )
set(FOO_ICONS_DIR   "@CMAKE_INSTALL_PREFIX@/share/icons" )
#...logic to determine installedPrefix from the own location...
set(FOO_CONFIG_DIR  "${installedPrefix}/@CONFIG_INSTALL_DIR@" )
```

All four options shown above are not sufficient The first three hardcode the absolute directory locations. The fourth case works only if the logic to determine the installedPrefix is correct, and if CONFIG_INSTALL_DIR contains a relative path, which in general cannot be guaranteed. This has the effect that the resulting FooConfig.cmake file would work poorly under Windows and macOS, where users are used to choosing the install location of a binary package at install time, independent from how CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> was set at build/cmake time.

Using configure_package_config_file() helps. If used correctly, it makes the resulting FooConfig.cmake file relocatable. Usage:

1.

Write a FooConfig.cmake.in file as you are used to.

2.

Insert a line at the top containing only the string @PACKAGE_INIT@.

3.

Instead of set(FOO_DIR "@SOME_INSTALL_DIR@"), use set(FOO_DIR "@PACKAGE_SOME_INSTALL_DIR@") (this must be after the @PACKAGE_INIT@ line).

4.

Instead of using the normal configure_file() <#command:configure_file> command, use configure_package_config_file().

The <input> and <output> arguments are the input and output file, the same way as in configure_file() <#command:configure_file>.

The <path> given to INSTALL_DESTINATION must be the destination where the FooConfig.cmake file will be installed to. This path can either be absolute, or relative to the INSTALL_PREFIX path.

The variables <var1> to <varN> given as PATH_VARS are the variables which contain install destinations. For each of them, the macro will create a helper variable PACKAGE_<var...>. These helper variables must be used in the FooConfig.cmake.in file for setting the installed location. They are calculated by configure_package_config_file() so that they are always relative to the installed location of the package. This works both for relative and also for absolute locations. For absolute locations, it works only if the absolute location is a subdirectory of INSTALL_PREFIX.

Added in version 3.30: The variable PACKAGE_PREFIX_DIR will always be defined after the @PACKAGE_INIT@ line. It will hold the value of the base install location. In general, variables defined via the PATH_VARS mechanism should be used instead, but PACKAGE_PREFIX_DIR can be used for those cases not easily handled by PATH_VARS, such as for files installed directly to the base install location rather than a subdirectory of it.

Note:

When consumers of the generated file use CMake 3.29 or older, the value of PACKAGE_PREFIX_DIR can be changed by a call to find_dependency() <#command:find_dependency> or find_package() <#command:find_package>. If a project relies on PACKAGE_PREFIX_DIR, it is the project's responsibility to ensure that the value of PACKAGE_PREFIX_DIR is preserved across any such calls, or any other calls which might include another file generated by configure_package_config_file().

Added in version 3.1: If the INSTALL_PREFIX argument is passed, this is used as the base path to calculate all the relative paths. The <path> argument must be an absolute path. If this argument is not passed, the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> variable will be used instead. The default value is good when generating a FooConfig.cmake file to use your package from the install tree. When generating a FooConfig.cmake file to use your package from the build tree, this option should be used.

By default, configure_package_config_file() also generates two helper macros, set_and_check() and check_required_components(), into the FooConfig.cmake file.

set_and_check() should be used instead of the normal set() <#command:set> command for setting directories and file locations. In addition to setting the variable, it also checks that the referenced file or directory actually exists and fails with a fatal error if it doesn't. This ensures that the generated FooConfig.cmake file does not contain wrong references. Add the NO_SET_AND_CHECK_MACRO option to prevent the generation of the set_and_check() macro in the FooConfig.cmake file.

check_required_components(<PackageName>) should be called at the end of the FooConfig.cmake file. This macro checks whether all requested, non-optional components have been found, and if this is not the case, it sets the Foo_FOUND variable to FALSE so that the package is considered to be not found. It does that by testing the Foo_<Component>_FOUND variables for all requested required components. This macro should be called even if the package doesn't provide any components to make sure users are not specifying components erroneously. Add the NO_CHECK_REQUIRED_COMPONENTS_MACRO option to prevent the generation of the check_required_components() macro in the FooConfig.cmake file.

See also Example Generating Package Files.

### Generating a Package Version File
write_basic_package_version_file

Create a version file for a project:

```
write_basic_package_version_file(<filename>

  [VERSION <major.minor.patch>]

  COMPATIBILITY <AnyNewerVersion|SameMajorVersion|SameMinorVersion|ExactVersion>

  [ARCH_INDEPENDENT] )
```

Writes a file for use as a <PackageName>ConfigVersion.cmake file to <filename>. See the documentation of find_package() <#command:find_package> for details on such files.

<filename> is the output filename, which should be in the build tree. <major.minor.patch> is the version number of the project to be installed.

If no VERSION is given, the PROJECT_VERSION <#variable:PROJECT_VERSION> variable is used. If this hasn't been set, it errors out.

The COMPATIBILITY mode AnyNewerVersion means that the installed package version will be considered compatible if it is newer or exactly the same as the requested version. This mode should be used for packages which are fully backward compatible, also across major versions. If SameMajorVersion is used instead, then the behavior differs from AnyNewerVersion in that the major version number must be the same as requested, e.g. version 2.0 will not be considered compatible if 1.0 is requested. This mode should be used for packages which guarantee backward compatibility within the same major version. If SameMinorVersion is used, the behavior is the same as SameMajorVersion, but both major and minor version must be the same as requested, e.g version 0.2 will not be compatible if 0.1 is requested. If ExactVersion is used, then the package is only considered compatible if the requested version matches exactly its own version number (not considering the tweak version). For example, version 1.2.3 of a package is only considered compatible to requested version 1.2.3. This mode is for packages without compatibility guarantees. If your project has more elaborate version matching rules, you will need to write your own custom <PackageName>ConfigVersion.cmake file instead of using this macro.

Added in version 3.11: The SameMinorVersion compatibility mode.

Added in version 3.14: If ARCH_INDEPENDENT is given, the installed package version will be considered compatible even if it was built for a different architecture than the requested architecture. Otherwise, an architecture check will be performed, and the package will be considered compatible only if the architecture matches exactly. For example, if the package is built for a 32-bit architecture, the package is only considered compatible if it is used on a 32-bit architecture, unless ARCH_INDEPENDENT is given, in which case the package is considered compatible on any architecture.

Note:

ARCH_INDEPENDENT is intended for header-only libraries or similar packages with no binaries.

Added in version 3.19: The version file generated by AnyNewerVersion, SameMajorVersion and SameMinorVersion arguments of COMPATIBILITY handle the version range, if one is specified (see find_package() <#command:find_package> command for the details). ExactVersion mode is incompatible with version ranges and will display an author warning if one is specified.

Internally, this macro executes configure_file() <#command:configure_file> to create the resulting version file. Depending on the COMPATIBILITY, the corresponding BasicConfigVersion-<COMPATIBILITY>.cmake.in file is used. Please note that these files are internal to CMake and you should not call configure_file() <#command:configure_file> on them yourself, but they can be used as a starting point to create more sophisticated custom <PackageName>ConfigVersion.cmake files.

### Generating an Apple Platform Selection File
generate_apple_platform_selection_file

Added in version 3.29.

Create an Apple platform selection file:

```
generate_apple_platform_selection_file(<filename>

  INSTALL_DESTINATION <path>

  [INSTALL_PREFIX <path>]

  [MACOS_INCLUDE_FILE <file>]

  [IOS_INCLUDE_FILE <file>]

  [IOS_SIMULATOR_INCLUDE_FILE <file>]

  [IOS_CATALYST_INCLUDE_FILE <file>]

  [TVOS_INCLUDE_FILE <file>]

  [TVOS_SIMULATOR_INCLUDE_FILE <file>]

  [WATCHOS_INCLUDE_FILE <file>]

  [WATCHOS_SIMULATOR_INCLUDE_FILE <file>]

  [VISIONOS_INCLUDE_FILE <file>]

  [VISIONOS_SIMULATOR_INCLUDE_FILE <file>]

  [ERROR_VARIABLE <variable>]

  )
```

Write a file that includes an Apple-platform-specific .cmake file, e.g., for use as <PackageName>Config.cmake. This can be used in conjunction with the XCFRAMEWORK_LOCATION argument of export(SETUP) <#setup> to export packages in a way that a project built for any Apple platform can use them.

INSTALL_DESTINATION <path>

Path to which the generated file will be installed by the caller, e.g., via install(FILES) <#files>. The path may be either relative to the INSTALL_PREFIX or absolute.

INSTALL_PREFIX <path>

Path prefix to which the package will be installed by the caller. The <path> argument must be an absolute path. If this argument is not passed, the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> variable will be used instead.

MACOS_INCLUDE_FILE <file>

File to include if the platform is macOS.

IOS_INCLUDE_FILE <file>

File to include if the platform is iOS.

IOS_SIMULATOR_INCLUDE_FILE <file>

File to include if the platform is iOS Simulator.

IOS_CATALYST_INCLUDE_FILE <file>

Added in version 3.31.

File to include if the platform is iOS Catalyst.

TVOS_INCLUDE_FILE <file>

File to include if the platform is tvOS.

TVOS_SIMULATOR_INCLUDE_FILE <file>

File to include if the platform is tvOS Simulator.

WATCHOS_INCLUDE_FILE <file>

File to include if the platform is watchOS.

WATCHOS_SIMULATOR_INCLUDE_FILE <file>

File to include if the platform is watchOS Simulator.

VISIONOS_INCLUDE_FILE <file>

File to include if the platform is visionOS.

VISIONOS_SIMULATOR_INCLUDE_FILE <file>

File to include if the platform is visionOS Simulator.

ERROR_VARIABLE <variable>

If the consuming project is built for an unsupported platform, set <variable> to an error message. The includer may use this information to pretend the package was not found. If this option is not given, the default behavior is to issue a fatal error.

If any of the optional include files is not specified, and the consuming project is built for its corresponding platform, the generated file will consider the platform to be unsupported. The behavior is determined by the ERROR_VARIABLE option.

### Generating an Apple Architecture Selection File
generate_apple_architecture_selection_file

Added in version 3.29.

Create an Apple architecture selection file:

```
generate_apple_architecture_selection_file(<filename>

  INSTALL_DESTINATION <path>

  [INSTALL_PREFIX <path>]

  [SINGLE_ARCHITECTURES <arch>...

   SINGLE_ARCHITECTURE_INCLUDE_FILES <file>...]

  [UNIVERSAL_ARCHITECTURES <arch>...

   UNIVERSAL_INCLUDE_FILE <file>]

  [ERROR_VARIABLE <variable>]

  )
```

Write a file that includes an Apple-architecture-specific .cmake file based on CMAKE_OSX_ARCHITECTURES <#variable:CMAKE_OSX_ARCHITECTURES>, e.g., for inclusion from an Apple-specific <PackageName>Config.cmake file.

INSTALL_DESTINATION <path>

Path to which the generated file will be installed by the caller, e.g., via install(FILES) <#files>. The path may be either relative to the INSTALL_PREFIX or absolute.

INSTALL_PREFIX <path>

Path prefix to which the package will be installed by the caller. The <path> argument must be an absolute path. If this argument is not passed, the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> variable will be used instead.

SINGLE_ARCHITECTURES <arch>...

Architectures provided by entries of SINGLE_ARCHITECTURE_INCLUDE_FILES.

SINGLE_ARCHITECTURE_INCLUDE_FILES <file>...

Architecture-specific files. One of them will be loaded when CMAKE_OSX_ARCHITECTURES <#variable:CMAKE_OSX_ARCHITECTURES> contains a single architecture matching the corresponding entry of SINGLE_ARCHITECTURES.

UNIVERSAL_ARCHITECTURES <arch>...

Architectures provided by the UNIVERSAL_INCLUDE_FILE. The list may include $(ARCHS_STANDARD) to support consumption using the Xcode <#generator:Xcode> generator, but the architectures should always be listed individually too.

UNIVERSAL_INCLUDE_FILE <file>

A file to load when CMAKE_OSX_ARCHITECTURES <#variable:CMAKE_OSX_ARCHITECTURES> contains a (non-strict) subset of the UNIVERSAL_ARCHITECTURES and does not match any one of the SINGLE_ARCHITECTURES.

ERROR_VARIABLE <variable>

If the consuming project is built for an unsupported architecture, set <variable> to an error message. The includer may use this information to pretend the package was not found. If this option is not given, the default behavior is to issue a fatal error.

### Example Generating Package Files
Example using both the configure_package_config_file() and write_basic_package_version_file() commands:

CMakeLists.txt

```
include(GNUInstallDirs)
set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR}/Foo

    CACHE PATH "Location of header files" )
set(SYSCONFIG_INSTALL_DIR ${CMAKE_INSTALL_SYSCONFDIR}/foo

    CACHE PATH "Location of configuration files" )
#...
include(CMakePackageConfigHelpers)
configure_package_config_file(FooConfig.cmake.in

  ${CMAKE_CURRENT_BINARY_DIR}/FooConfig.cmake

  INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Foo

  PATH_VARS INCLUDE_INSTALL_DIR SYSCONFIG_INSTALL_DIR)
write_basic_package_version_file(

  ${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake

  VERSION 1.2.3

  COMPATIBILITY SameMajorVersion )
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/FooConfig.cmake

              ${CMAKE_CURRENT_BINARY_DIR}/FooConfigVersion.cmake

        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Foo )
```

FooConfig.cmake.in

```
set(FOO_VERSION x.y.z)
...
@PACKAGE_INIT@
...
set_and_check(FOO_INCLUDE_DIR "@PACKAGE_INCLUDE_INSTALL_DIR@")
set_and_check(FOO_SYSCONFIG_DIR "@PACKAGE_SYSCONFIG_INSTALL_DIR@")
check_required_components(Foo)
```

### CMakePrintHelpers
This module provides convenience commands, primarily intended for debugging, to print the values of properties and variables.

Load this module in CMake with:

```
include(CMakePrintHelpers)
```

### Commands
This module provides the following commands:

cmake_print_properties

Prints the values of properties for the specified targets, source files, directories, tests, or cache entries:

```
cmake_print_properties(

  <TARGETS       [<targets>...] |

   SOURCES       [<sources>...] |

   DIRECTORIES   [<dirs>...]    |

   TESTS         [<tests>...]   |

   CACHE_ENTRIES [<entries>...] >

  PROPERTIES [<properties>...]
)
```

Exactly one of the scope keywords must be specified. The scope keyword and its arguments must appear before the PROPERTIES keyword in the argument list.

cmake_print_variables

Prints each variable name followed by its value:

```
cmake_print_variables([<vars>...])
```

### Examples
Printing the LOCATION and INTERFACE_INCLUDE_DIRECTORIES properties for both targets foo and bar:

```
include(CMakePrintHelpers)
cmake_print_properties(

  TARGETS foo bar

  PROPERTIES LOCATION INTERFACE_INCLUDE_DIRECTORIES
)
```

Gives:

```
--

 Properties for TARGET foo:

   foo.LOCATION = "/usr/lib/libfoo.so"

   foo.INTERFACE_INCLUDE_DIRECTORIES = "/usr/include;/usr/include/foo"

 Properties for TARGET bar:

   bar.LOCATION = "/usr/lib/libbar.so"

   bar.INTERFACE_INCLUDE_DIRECTORIES = "/usr/include;/usr/include/bar"
```

Printing given variables:

```
include(CMakePrintHelpers)
cmake_print_variables(CMAKE_C_COMPILER CMAKE_MAJOR_VERSION NOT_EXISTS)
```

Gives:

```
-- CMAKE_C_COMPILER="/usr/bin/cc" ; CMAKE_MAJOR_VERSION="3" ; NOT_EXISTS=""
```

### CMakePrintSystemInformation
This module can be used for diagnostics to print system information.

Load this module in a CMake project with:

```
include(CMakePrintSystemInformation)
```

### Examples
For example, including this module in a project:

CMakeLists.txt

```
project(Example)
# ...
include(CMakePrintSystemInformation)
```

prints various CMake variables:

```
CMAKE_SYSTEM is Linux-6.11.0-17-generic Linux 6.11.0-17-generic x86_64
CMAKE_SYSTEM file is Platform/Linux
CMAKE_C_COMPILER is /usr/bin/cc
CMAKE_CXX_COMPILER is /usr/bin/c++
CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS is -shared
CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS is -shared
...
```

### CMakePushCheckState
This module provides commands for managing the state of variables that influence how various CMake check commands (e.g., check_symbol_exists() <#command:check_symbol_exists>, etc.) are performed.

Load this module in a CMake project with:

```
include(CMakePushCheckState)
```

This module provides the following commands, which are useful for scoped configuration, for example, in CMake modules or when performing checks in a controlled environment, ensuring that temporary modifications are isolated to the scope of the check and do not propagate into other parts of the build system:

- cmake_push_check_state()

- cmake_reset_check_state()

- cmake_pop_check_state()

### Affected Variables
The following CMake variables are saved, reset, and restored by this module's commands:

CMAKE_REQUIRED_FLAGS

A space-separated string of additional flags to pass to the compiler. A semicolon-separated list <#cmake-language-lists> will not work. The contents of CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and its associated configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG> <#variable:CMAKE_<LANG>_FLAGS_<CONFIG>> variables are automatically prepended to the compiler command before the contents of this variable.

CMAKE_REQUIRED_DEFINITIONS

A semicolon-separated list <#cmake-language-lists> of compiler definitions, each of the form -DFOO or -DFOO=bar. A definition for the name specified by the result variable argument of the check command is also added automatically.

CMAKE_REQUIRED_INCLUDES

A semicolon-separated list <#cmake-language-lists> of header search paths to pass to the compiler. These will be the only header search paths used; the contents of the INCLUDE_DIRECTORIES <#prop_dir:INCLUDE_DIRECTORIES> directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

A semicolon-separated list <#cmake-language-lists> of options to add to the link command (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LIBRARIES

A semicolon-separated list <#cmake-language-lists> of libraries to add to the link command. These can be the names of system libraries, or they can be Imported Targets <#imported-targets> (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A semicolon-separated list <#cmake-language-lists> of library search paths to pass to the linker (see try_compile() <#command:try_compile> for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

CMAKE_EXTRA_INCLUDE_FILES

Added in version 3.6: Previously used already by the check_type_size() <#command:check_type_size> command; now also supported by this module.

A semicolon-separated list <#cmake-language-lists> of extra header files to include when performing the check.

Note:

Other CMake variables, such as CMAKE_<LANG>_FLAGS <#variable:CMAKE_<LANG>_FLAGS>, propagate to all checks regardless of commands provided by this module, as those fundamental variables are designed to influence the global state of the build system.

### Commands
cmake_push_check_state

Pushes (saves) the current states of the above variables onto a stack:

```
cmake_push_check_state([RESET])
```

Use this command to preserve the current configuration before making temporary modifications for specific checks.

RESET

When this option is specified, the command not only saves the current states of the listed variables but also resets them to empty, allowing them to be reconfigured from a clean state.

cmake_reset_check_state

Resets (clears) the contents of the variables listed above to empty states:

```
cmake_reset_check_state()
```

Use this command when performing multiple sequential checks that require entirely new configurations, ensuring no previous configuration unintentionally carries over.

cmake_pop_check_state

Restores the states of the variables listed above to their values at the time of the most recent cmake_push_check_state() call:

```
cmake_pop_check_state()
```

Use this command to revert temporary changes made during a check. To prevent unexpected behavior, pair each cmake_push_check_state() with a corresponding cmake_pop_check_state().

### Example: Isolated Check With Compile Definitions
In the following example, a check for the C symbol memfd_create() is performed with an additional _GNU_SOURCE compile definition, without affecting global compile flags. The RESET option is used to ensure that any prior values of the check-related variables are explicitly cleared before the check.

```
include(CMakePushCheckState)
# Save and reset the current state
cmake_push_check_state(RESET)
# Perform check with specific compile definitions
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
include(CheckSymbolExists)
check_symbol_exists(memfd_create "sys/mman.h" HAVE_MEMFD_CREATE)
# Restore the original state
cmake_pop_check_state()
```

### Example: Nested Configuration Scopes
In the following example, variable states are pushed onto the stack multiple times, allowing for sequential or nested checks. Each cmake_pop_check_state() restores the most recent pushed states.

```
include(CMakePushCheckState)
# Save and reset the current state
cmake_push_check_state(RESET)
# Perform the first check with additional libraries
set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_DL_LIBS})
include(CheckSymbolExists)
check_symbol_exists(dlopen "dlfcn.h" HAVE_DLOPEN)
# Save current state
cmake_push_check_state()
# Perform the second check with libraries and additional compile definitions
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
check_symbol_exists(dladdr "dlfcn.h" HAVE_DLADDR)
message(STATUS "${CMAKE_REQUIRED_DEFINITIONS}")
# Output: -D_GNU_SOURCE
# Restore the previous state
cmake_pop_check_state()
message(STATUS "${CMAKE_REQUIRED_DEFINITIONS}")
# Output here is empty
# Reset variables to prepare for the next check
cmake_reset_check_state()
# Perform the next check only with additional compile definitions
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
check_symbol_exists(dl_iterate_phdr "link.h" HAVE_DL_ITERATE_PHDR)
# Restore the original state
cmake_pop_check_state()
```

### CMakeVerifyManifest
This module is intended to be used in command-line mode using the cmake -P <#script-processing-mode> to verify that embedded manifests and side-by-side manifests for a project match.

Load this module in a CMake script with:

```
include(CMakeVerifyManifest)
```

This module first recursively globs *.manifest files from the current source directory and creates a list of allowed versions.

Next, the script globs all *.exe and *.dll files. Each .exe and .dll file is scanned for embedded manifests and the versions of CRT are checked to be in the list of allowed versions.

### Input Variables
This module accepts the following variables:

allow_versions

Additional versions can be passed by setting the allow_versions variable from the invocation command. This enables using additional embedded manifest versions in a project, even if that version was not found in a .manifest file.

### Examples
To use this module in the project, create a local command-line script (for example, in the project's subdirectory cmake/scripts) and include the module:

cmake/scripts/verify-manifest.cmake

```
include(CMakeVerifyManifest)
```

Then run the local script in command-line and, for example, specify additional embedded manifest of 8.0.50608.0 to be used in a project:

```
cmake -Dallow_versions=8.0.50608.0 -Pcmake/scripts/verify-manifest.cmake
```

### CPack
This module configures generators for binary installers and source packages.

Load this module in a CMake project with:

```
include(CPack)
```

### Introduction
The CPack module generates the configuration files CPackConfig.cmake and CPackSourceConfig.cmake. They are intended for use in a subsequent run of the cpack <#manual:cpack(1)> program where they steer the generation of installers or/and source packages.

Depending on the CMake generator, the CPack module may also add two new build targets, package and package_source. See the packaging targets section below for details.

The generated binary installers will contain all files that have been installed via CMake's install() <#command:install> command (and the deprecated commands install_files() <#command:install_files>, install_programs() <#command:install_programs>, and install_targets() <#command:install_targets>). Note that the DESTINATION option of the install() <#command:install> command must be a relative path; otherwise installed files are ignored by CPack.

Certain kinds of binary installers can be configured such that users can select individual application components to install. See the CPackComponent <#module:CPackComponent> module for further details.

Source packages (configured through CPackSourceConfig.cmake and generated by the CPack Archive Generator <#cpack_gen:CPack Archive Generator>) will contain all source files in the project directory except those specified in CPACK_SOURCE_IGNORE_FILES.

### CPack Generators
The CPACK_GENERATOR variable has different meanings in different contexts. In a CMakeLists.txt file, CPACK_GENERATOR is a list of generators: and when cpack <#manual:cpack(1)> is run with no other arguments, it will iterate over that list and produce one package for each generator. In a CPACK_PROJECT_CONFIG_FILE, CPACK_GENERATOR is a string naming a single generator. If you need per-cpack-generator logic to control other cpack settings, then you need a CPACK_PROJECT_CONFIG_FILE. If set, the CPACK_PROJECT_CONFIG_FILE is included automatically on a per-generator basis. It only need contain overrides.

Here's how it works:

- cpack <#manual:cpack(1)> runs

- it includes CPackConfig.cmake

- it iterates over the generators given by the -G <#cmdoption-cpack-G> command line option, or if no such option was specified, over the list of generators given by the CPACK_GENERATOR variable set in the CPackConfig.cmake input file.

- foreach generator, it then

- sets CPACK_GENERATOR to the one currently being iterated

- includes the CPACK_PROJECT_CONFIG_FILE

- produces the package for that generator

This is the key: For each generator listed in CPACK_GENERATOR in CPackConfig.cmake, cpack will reset CPACK_GENERATOR internally to the one currently being used and then include the CPACK_PROJECT_CONFIG_FILE.

For a list of available generators, see cpack-generators(7) <#manual:cpack-generators(7)>.

### Targets package and package_source
If CMake is run with the Makefile, Ninja, or Xcode generator, then include(CPack) generates a target package. This makes it possible to build a binary installer from CMake, Make, or Ninja: Instead of cpack, one may call cmake --build . --target package or make package or ninja package. The VS generator creates an uppercase target PACKAGE.

If CMake is run with the Makefile or Ninja generator, then include(CPack) also generates a target package_source. To build a source package, instead of cpack -G TGZ --config CPackSourceConfig.cmake one may call cmake --build . --target package_source, make package_source, or ninja package_source.

### Variables common to all CPack Generators
Before including this CPack module in your CMakeLists.txt file, there are a variety of variables that can be set to customize the resulting installers. The most commonly-used variables are:

CPACK_PACKAGE_NAME

The name of the package (or application). If not specified, it defaults to the project name.

CPACK_PACKAGE_VENDOR

The name of the package vendor. (e.g., "Kitware"). The default is "Humanity".

CPACK_PACKAGE_DIRECTORY

The directory in which CPack is doing its packaging. If it is not set then this will default (internally) to the build dir. This variable may be defined in a CPack config file or from the cpack <#manual:cpack(1)> command line option -B. If set, the command line option overrides the value found in the config file.

CPACK_PACKAGE_VERSION_MAJOR

Package major version. This variable will always be set, but its default value depends on whether or not version details were given to the project() <#command:project> command in the top level CMakeLists.txt file. If version details were given, the default value will be CMAKE_PROJECT_VERSION_MAJOR <#variable:CMAKE_PROJECT_VERSION_MAJOR>. If no version details were given, a default version of 0.1.1 will be assumed, leading to CPACK_PACKAGE_VERSION_MAJOR having a default value of 0.

CPACK_PACKAGE_VERSION_MINOR

Package minor version. The default value is determined based on whether or not version details were given to the project() <#command:project> command in the top level CMakeLists.txt file. If version details were given, the default value will be CMAKE_PROJECT_VERSION_MINOR <#variable:CMAKE_PROJECT_VERSION_MINOR>, but if no minor version component was specified then CPACK_PACKAGE_VERSION_MINOR will be left unset. If no project version was given at all, a default version of 0.1.1 will be assumed, leading to CPACK_PACKAGE_VERSION_MINOR having a default value of 1.

CPACK_PACKAGE_VERSION_PATCH

Package patch version. The default value is determined based on whether or not version details were given to the project() <#command:project> command in the top level CMakeLists.txt file. If version details were given, the default value will be CMAKE_PROJECT_VERSION_PATCH <#variable:CMAKE_PROJECT_VERSION_PATCH>, but if no patch version component was specified then CPACK_PACKAGE_VERSION_PATCH will be left unset. If no project version was given at all, a default version of 0.1.1 will be assumed, leading to CPACK_PACKAGE_VERSION_PATCH having a default value of 1.

CPACK_PACKAGE_DESCRIPTION

A description of the project, used in places such as the introduction screen of CPack-generated Windows installers. If not set, the value of this variable is populated from the file named by CPACK_PACKAGE_DESCRIPTION_FILE.

CPACK_PACKAGE_DESCRIPTION_FILE

A text file used to describe the project when CPACK_PACKAGE_DESCRIPTION is not explicitly set. The default value for CPACK_PACKAGE_DESCRIPTION_FILE points to a built-in template file Templates/CPack.GenericDescription.txt.

CPACK_PACKAGE_DESCRIPTION_SUMMARY

Short description of the project (only a few words). If the CMAKE_PROJECT_DESCRIPTION <#variable:CMAKE_PROJECT_DESCRIPTION> variable is set, it is used as the default value, otherwise the default will be a string generated by CMake based on CMAKE_PROJECT_NAME <#variable:CMAKE_PROJECT_NAME>.

CPACK_PACKAGE_HOMEPAGE_URL

Project homepage URL. The default value is taken from the CMAKE_PROJECT_HOMEPAGE_URL <#variable:CMAKE_PROJECT_HOMEPAGE_URL> variable, which is set by the top level project() <#command:project> command, or else the default will be empty if no URL was provided to project() <#command:project>.

CPACK_PACKAGE_FILE_NAME

The name of the package file to generate, not including the extension. For example, cmake-2.6.1-Linux-i686. The default value is:

```
${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}-${CPACK_SYSTEM_NAME}
```

CPACK_PACKAGE_INSTALL_DIRECTORY

Installation directory on the target system. This may be used by some CPack generators like NSIS to create an installation directory e.g., "CMake 2.5" below the installation prefix. All installed elements will be put inside this directory.

CPACK_PACKAGE_ICON

A branding image that will be displayed inside the installer (used by GUI installers).

CPACK_PACKAGE_CHECKSUM

Added in version 3.7.

One or multiple algorithms that will be used to generate additional files with the checksum of the package. The output file names will be:

```
${CPACK_PACKAGE_FILE_NAME}.${CPACK_PACKAGE_CHECKSUM}
```

Supported algorithms are those listed by the string(<HASH>) <#supported-hash-algorithms> command.

Changed in version 4.2: The variable accepts a list of algorithms.

CPACK_PROJECT_CONFIG_FILE

CPack-time project CPack configuration file. This file is included at cpack time, once per generator after CPack has set CPACK_GENERATOR to the actual generator being used. It allows per-generator setting of CPACK_* variables at cpack time.

CPACK_RESOURCE_FILE_LICENSE

License to be embedded in the installer. It will typically be displayed to the user by the produced installer (often with an explicit "Accept" button, for graphical installers) prior to installation. This license file is NOT added to the installed files but is used by some CPack generators like NSIS. If you want to use UTF-8 characters, the file needs to be encoded in UTF-8 BOM. If you want to install a license file (may be the same as this one) along with your project, you must add an appropriate CMake install() <#command:install> command in your CMakeLists.txt.

CPACK_RESOURCE_FILE_README

ReadMe file to be embedded in the installer. It typically describes in some detail the purpose of the project during the installation. Not all CPack generators use this file.

CPACK_RESOURCE_FILE_WELCOME

Welcome file to be embedded in the installer. It welcomes users to this installer. Typically used in the graphical installers on Windows and Mac OS X.

CPACK_MONOLITHIC_INSTALL

Disables the component-based installation mechanism. When set, the component specification is ignored and all installed items are put in a single "MONOLITHIC" package. Some CPack generators do monolithic packaging by default and may be asked to do component packaging by setting CPACK_<GENNAME>_COMPONENT_INSTALL to TRUE.

CPACK_GENERATOR

List of CPack generators to use. If not specified, CPack will create a set of options following the naming pattern CPACK_BINARY_<GENNAME> (e.g. CPACK_BINARY_NSIS) allowing the user to enable/disable individual generators. If the -G <#cmdoption-cpack-G> option is given on the cpack <#manual:cpack(1)> command line, it will override this variable and any CPACK_BINARY_<GENNAME> options.

CPACK_OUTPUT_CONFIG_FILE

The name of the CPack binary configuration file. This file is the CPack configuration generated by the CPack module for binary installers. Defaults to CPackConfig.cmake.

CPACK_PACKAGE_EXECUTABLES

Lists each of the executables and associated text label to be used to create Start Menu shortcuts. For example, setting this to the list ccmake;CMake will create a shortcut named "CMake" that will execute the installed executable ccmake. Not all CPack generators use it (at least NSIS, Inno Setup and WIX do).

CPACK_STRIP_FILES

List of files to be stripped. Starting with CMake 2.6.0, CPACK_STRIP_FILES will be a boolean variable which enables stripping of all files (a list of files evaluates to TRUE in CMake, so this change is compatible).

CPACK_VERBATIM_VARIABLES

Added in version 3.4.

If set to TRUE, values of variables prefixed with CPACK_ will be escaped before being written to the configuration files, so that the cpack program receives them exactly as they were specified. If not, characters like quotes and backslashes can cause parsing errors or alter the value received by the cpack program. Defaults to FALSE for backwards compatibility.

CPACK_THREADS

Added in version 3.20.

Number of threads to use when performing parallelized operations, such as compressing the installer package.

Some compression methods used by CPack generators such as Debian or Archive may take advantage of multiple CPU cores to speed up compression. CPACK_THREADS can be set to specify how many threads will be used for compression.

A positive integer can be used to specify an exact desired thread count.

When given a negative integer CPack will use the absolute value as the upper limit but may choose a lower value based on the available hardware concurrency.

Given 0 CPack will try to use all available CPU cores.

By default CPACK_THREADS is set to 1.

The following compression methods may take advantage of multiple cores:

xz

Supported if CMake is built with a liblzma that supports parallel compression. Added in version 3.21: Official CMake binaries available on cmake.org now ship with a liblzma that supports parallel compression. Older versions did not.

zstd

Added in version 3.24.

Supported if CMake is built with libarchive 3.6 or higher. Official CMake binaries available on cmake.org support it.

Other compression methods ignore this value and use only one thread.

CPACK_COMPRESSION_LEVEL

Added in version 4.3.

Select the compression level to use when it's applicable, such as compressing the installer package.

Some compression methods used by CPack generators such as Debian or Archive may take advantage of different compression levels. The accepted values are in the range 0 to 9. If you select the zstd compression method, you can select the compression level between 0 and 19, except the zip archive format.

By default CPACK_COMPRESSION_LEVEL is set to 0, which selects the default compression level. It is selected automatically by the archive library backend and not directly set by CMake itself. The default compression level may vary between archive formats, platforms, etc.

### Variables for Source Package Generators
The following CPack variables are specific to source packages, and will not affect binary packages:

CPACK_SOURCE_PACKAGE_FILE_NAME

The name of the source package. For example cmake-2.6.1.

CPACK_SOURCE_STRIP_FILES

List of files in the source tree that will be stripped. Starting with CMake 2.6.0, CPACK_SOURCE_STRIP_FILES will be a boolean variable which enables stripping of all files (a list of files evaluates to TRUE in CMake, so this change is compatible).

CPACK_SOURCE_GENERATOR

List of generators used for the source packages. As with CPACK_GENERATOR, if this is not specified then CPack will create a set of options (e.g. CPACK_SOURCE_ZIP) allowing users to select which packages will be generated.

CPACK_SOURCE_OUTPUT_CONFIG_FILE

The name of the CPack source configuration file. This file is the CPack configuration generated by the CPack module for source installers. Defaults to CPackSourceConfig.cmake.

CPACK_SOURCE_IGNORE_FILES

Pattern of files in the source tree that won't be packaged when building a source package. This is a list of regular expression patterns (that must be properly escaped), e.g., /CVS/;/\\.svn/;\\.swp$;\\.#;/#;.*~;cscope.*

### Variables for Advanced Use
The following variables are for advanced uses of CPack:

CPACK_CMAKE_GENERATOR

What CMake generator should be used if the project is a CMake project. Defaults to the value of CMAKE_GENERATOR <#variable:CMAKE_GENERATOR>. Few users will want to change this setting.

CPACK_INSTALL_CMAKE_PROJECTS

List of four values that specify what project to install. The four values are: Build directory, Project Name, Project Component, Directory. If omitted, CPack will build an installer that installs everything.

CPACK_SYSTEM_NAME

System name, defaults to the value of CMAKE_SYSTEM_NAME <#variable:CMAKE_SYSTEM_NAME>, except on Windows where it will be win32 or win64.

CPACK_PACKAGE_VERSION

Package full version, used internally. By default, this is built from CPACK_PACKAGE_VERSION_MAJOR, CPACK_PACKAGE_VERSION_MINOR, and CPACK_PACKAGE_VERSION_PATCH.

CPACK_TOPLEVEL_TAG

Directory for the installed files.

CPACK_INSTALL_COMMANDS

Extra commands to install components. The environment variable CMAKE_INSTALL_PREFIX is set to the temporary install directory during execution.

CPACK_INSTALL_SCRIPTS

Added in version 3.16.

Extra CMake scripts executed by CPack during its local staging installation. They are executed before installing the files to be packaged. The scripts are not called by a standalone install (e.g.: make install). For every script, the following variables will be set: CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>, CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> and CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> (which is set to the staging install directory). The singular form CMAKE_INSTALL_SCRIPT is supported as an alternative variable for historical reasons, but its value is ignored if CMAKE_INSTALL_SCRIPTS is set and a warning will be issued.

See also CPACK_PRE_BUILD_SCRIPTS and CPACK_POST_BUILD_SCRIPTS which can be used to specify scripts to be executed later in the packaging process.

CPACK_PRE_BUILD_SCRIPTS

Added in version 3.19.

List of CMake scripts to execute after CPack has installed the files to be packaged into a staging directory and before producing the package(s) from those files. See also CPACK_INSTALL_SCRIPTS and CPACK_POST_BUILD_SCRIPTS.

CPACK_POST_BUILD_SCRIPTS

Added in version 3.19.

List of CMake scripts to execute after CPack has produced the resultant packages and before copying them back to the build directory. See also CPACK_INSTALL_SCRIPTS, CPACK_PRE_BUILD_SCRIPTS and CPACK_PACKAGE_FILES.

CPACK_PACKAGE_FILES

Added in version 3.19.

List of package files created in the staging directory, with each file provided as a full absolute path. This variable is populated by CPack just before invoking the post-build scripts listed in CPACK_POST_BUILD_SCRIPTS. It is the preferred way for the post-build scripts to know the set of package files to operate on. Projects should not try to set this variable themselves.

CPACK_INSTALLED_DIRECTORIES

Extra directories to install.

CPACK_PACKAGE_INSTALL_REGISTRY_KEY

Registry key used when installing this project. This is only used by installers for Windows. The default value is based on the installation directory.

CPACK_CREATE_DESKTOP_LINKS

List of desktop links to create. Each desktop link requires a corresponding start menu shortcut as created by CPACK_PACKAGE_EXECUTABLES.

CPACK_BINARY_<GENNAME>

CPack generated options for binary generators. The CPack.cmake module generates (when CPACK_GENERATOR is not set) a set of CMake options (see CMake option() <#command:option> command) which may then be used to select the CPack generator(s) to be used when building the package target or when running cpack <#manual:cpack(1)> without the -G <#cmdoption-cpack-G> option.

CPACK_READELF_EXECUTABLE

Added in version 3.25.

Specify the readelf executable path used by CPack. The default value will be taken from the CMAKE_READELF variable, if set, which may be populated CMake when enabling languages. If CMAKE_READELF is not set, CPack will use find_program() <#command:find_program> to determine the readelf path when needed.

CPACK_OBJCOPY_EXECUTABLE

Added in version 3.25.

Specify the objcopy executable path used by CPack. The default value will be taken from the CMAKE_OBJCOPY variable, if set, which may be populated by CMake when enabling languages. If CMAKE_OBJCOPY is not set, CPack will use find_program() <#command:find_program> to determine the objcopy path when needed.

CPACK_OBJDUMP_EXECUTABLE

Added in version 3.25.

Specify the objdump executable path used by CPack. The default value will be taken from the CMAKE_OBJDUMP <#variable:CMAKE_OBJDUMP> variable, which may be populated by CMake when enabling languages. If CMAKE_OBJDUMP is not set, CPack will use find_program() <#command:find_program> to determine the objdump path when needed.

### CPackComponent
This module provides commands to configure components for binary installers and source packages.

Load this module in a CMake project with:

```
include(CPackComponent)
```

### Introduction
This module is also automatically included by CPack <#module:CPack>.

Certain binary installers (especially the graphical installers) generated by CPack allow users to select individual application components to install. This module allows developers to configure the packaging of such components.

Contents is assigned to components by the COMPONENT argument of CMake's install() <#command:install> command. Components can be annotated with user-friendly names and descriptions, inter-component dependencies, etc., and grouped in various ways to customize the resulting installer, using the commands described below.

To specify different groupings for different CPack generators use a CPACK_PROJECT_CONFIG_FILE.

### Variables
The following variables influence the component-specific packaging:

CPACK_COMPONENTS_ALL

The list of component to install. The default value of this variable is computed by CPack and contains all components defined by the project. The user may set it to only include the specified components.

Instead of specifying all the desired components, it is possible to obtain a list of all defined components and then remove the unwanted ones from the list. The get_cmake_property() <#command:get_cmake_property> command can be used to obtain the COMPONENTS property, then the list(REMOVE_ITEM) <#remove-item> command can be used to remove the unwanted ones. For example, to use all defined components except foo and bar:

```
get_cmake_property(CPACK_COMPONENTS_ALL COMPONENTS)
list(REMOVE_ITEM CPACK_COMPONENTS_ALL "foo" "bar")
```

CPACK_<GENNAME>_COMPONENT_INSTALL

Enable/Disable component install for CPack generator <GENNAME>. Each CPack Generator (RPM, DEB, ARCHIVE, NSIS, DMG, etc...) has a legacy default behavior. e.g. RPM builds monolithic whereas NSIS builds component. One can change the default behavior by setting this variable to 0/1 or OFF/ON.

CPACK_COMPONENTS_GROUPING

Specify how components are grouped for multi-package component-aware CPack generators. Some generators like RPM or ARCHIVE (TGZ, ZIP, ...) may generate several packages files when there are components, depending on the value of this variable:

- ONE_PER_GROUP (default): create one package per component group

- IGNORE : create one package per component (ignore the groups)

- ALL_COMPONENTS_IN_ONE : create a single package with all requested components

CPACK_COMPONENT_<compName>_DISPLAY_NAME

The name to be displayed for a component.

CPACK_COMPONENT_<compName>_DESCRIPTION

The description of a component.

CPACK_COMPONENT_<compName>_GROUP

The group of a component.

CPACK_COMPONENT_<compName>_DEPENDS

The dependencies (list of components) on which this component depends.

CPACK_COMPONENT_<compName>_HIDDEN

True if this component is hidden from the user.

CPACK_COMPONENT_<compName>_REQUIRED

True if this component is required.

CPACK_COMPONENT_<compName>_DISABLED

True if this component is not selected to be installed by default.

### Add component
cpack_add_component

Describe an installation component.

```
cpack_add_component(compname

                    [DISPLAY_NAME name]

                    [DESCRIPTION description]

                    [HIDDEN | REQUIRED | DISABLED ]

                    [GROUP group]

                    [DEPENDS comp1 comp2 ... ]

                    [INSTALL_TYPES type1 type2 ... ]

                    [DOWNLOADED]

                    [ARCHIVE_FILE filename]

                    [PLIST filename])
```

compname is the name of an installation component, as defined by the COMPONENT argument of one or more CMake install() <#command:install> commands. With the cpack_add_component command one can set a name, a description, and other attributes of an installation component. One can also assign a component to a component group.

DISPLAY_NAME is the displayed name of the component, used in graphical installers to display the component name. This value can be any string.

DESCRIPTION is an extended description of the component, used in graphical installers to give the user additional information about the component. Descriptions can span multiple lines using \n as the line separator. Typically, these descriptions should be no more than a few lines long.

HIDDEN indicates that this component will be hidden in the graphical installer, so that the user cannot directly change whether it is installed or not.

REQUIRED indicates that this component is required, and therefore will always be installed. It will be visible in the graphical installer, but it cannot be unselected. (Typically, required components are shown grayed out).

DISABLED indicates that this component should be disabled (unselected) by default. The user is free to select this component for installation, unless it is also HIDDEN.

DEPENDS lists the components on which this component depends. If this component is selected, then each of the components listed must also be selected. The dependency information is encoded within the installer itself, so that users cannot install inconsistent sets of components.

GROUP names the component group of which this component is a part. If not provided, the component will be a standalone component, not part of any component group. Component groups are described with the cpack_add_component_group command, detailed below.

INSTALL_TYPES lists the installation types of which this component is a part. When one of these installations types is selected, this component will automatically be selected. Installation types are described with the cpack_add_install_type command, detailed below.

DOWNLOADED indicates that this component should be downloaded on-the-fly by the installer, rather than packaged in with the installer itself. For more information, see the cpack_configure_downloads command.

ARCHIVE_FILE provides a name for the archive file created by CPack to be used for downloaded components. If not supplied, CPack will create a file with some name based on CPACK_PACKAGE_FILE_NAME and the name of the component. See cpack_configure_downloads for more information.

PLIST gives a filename that is passed to pkgbuild with the --component-plist argument when using the productbuild generator.

### Add component group
cpack_add_component_group

Describes a group of related CPack installation components.

```
cpack_add_component_group(groupname

                         [DISPLAY_NAME name]

                         [DESCRIPTION description]

                         [PARENT_GROUP parent]

                         [EXPANDED]

                         [BOLD_TITLE])
```

The cpack_add_component_group describes a group of installation components, which will be placed together within the listing of options. Typically, component groups allow the user to select/deselect all of the components within a single group via a single group-level option. Use component groups to reduce the complexity of installers with many options. groupname is an arbitrary name used to identify the group in the GROUP argument of the cpack_add_component command, which is used to place a component in a group. The name of the group must not conflict with the name of any component.

DISPLAY_NAME is the displayed name of the component group, used in graphical installers to display the component group name. This value can be any string.

DESCRIPTION is an extended description of the component group, used in graphical installers to give the user additional information about the components within that group. Descriptions can span multiple lines using \n as the line separator. Typically, these descriptions should be no more than a few lines long.

PARENT_GROUP, if supplied, names the parent group of this group. Parent groups are used to establish a hierarchy of groups, providing an arbitrary hierarchy of groups.

EXPANDED indicates that, by default, the group should show up as "expanded", so that the user immediately sees all of the components within the group. Otherwise, the group will initially show up as a single entry.

BOLD_TITLE indicates that the group title should appear in bold, to call the user's attention to the group.

### Add installation type
cpack_add_install_type

Add a new installation type containing a set of predefined component selections to the graphical installer.

```
cpack_add_install_type(typename

                       [DISPLAY_NAME name])
```

The cpack_add_install_type command identifies a set of preselected components that represents a common use case for an application. For example, a "Developer" install type might include an application along with its header and library files, while an "End user" install type might just include the application's executable. Each component identifies itself with one or more install types via the INSTALL_TYPES argument to cpack_add_component.

DISPLAY_NAME is the displayed name of the install type, which will typically show up in a drop-down box within a graphical installer. This value can be any string.

### Configure downloads
cpack_configure_downloads

Configure CPack to download selected components on-the-fly as part of the installation process.

```
cpack_configure_downloads(site

                          [UPLOAD_DIRECTORY dirname]

                          [ALL]

                          [ADD_REMOVE|NO_ADD_REMOVE])
```

The cpack_configure_downloads command configures installation-time downloads of selected components. For each downloadable component, CPack will create an archive containing the contents of that component, which should be uploaded to the given site. When the user selects that component for installation, the installer will download and extract the component in place. This feature is useful for creating small installers that only download the requested components, saving bandwidth. Additionally, the installers are small enough that they will be installed as part of the normal installation process, and the "Change" button in Windows Add/Remove Programs control panel will allow one to add or remove parts of the application after the original installation. On Windows, the downloaded-components functionality requires the ZipDLL plug-in for NSIS, available at:

```
http://nsis.sourceforge.net/ZipDLL_plug-in
```

On macOS, installers that download components on-the-fly can only be built and installed on system using macOS 10.5 or later.

The site argument is a URL where the archives for downloadable components will reside, e.g., <https://cmake.org/files/v3.25/> All of the archives produced by CPack should be uploaded to that location.

UPLOAD_DIRECTORY is the local directory where CPack will create the various archives for each of the components. The contents of this directory should be uploaded to a location accessible by the URL given in the site argument. If omitted, CPack will use the directory CPackUploads inside the CMake binary directory to store the generated archives.

The ALL flag indicates that all components be downloaded. Otherwise, only those components explicitly marked as DOWNLOADED or that have a specified ARCHIVE_FILE will be downloaded. Additionally, the ALL option implies ADD_REMOVE (unless NO_ADD_REMOVE is specified).

ADD_REMOVE indicates that CPack should install a copy of the installer that can be called from Windows' Add/Remove Programs dialog (via the "Modify" button) to change the set of installed components. NO_ADD_REMOVE turns off this behavior. This option is ignored on Mac OS X.

### CPackIFW
Added in version 3.1.

This module looks for the location of the command-line utilities supplied with the Qt Installer Framework <https://doc.qt.io/qtinstallerframework/index.html> (QtIFW).

Load this module in a CMake project with:

```
include(CPackIFW)
```

The module also defines several commands to control the behavior of the CPack IFW Generator <#cpack_gen:CPack IFW Generator>.

### Commands
The module defines the following commands:

cpack_ifw_configure_component

Sets the arguments specific to the CPack IFW generator.

```
cpack_ifw_configure_component(<compname> [COMMON] [ESSENTIAL] [VIRTUAL]

                    [FORCED_INSTALLATION] [REQUIRES_ADMIN_RIGHTS]

                    [NAME <name>]

                    [DISPLAY_NAME <display_name>] # Note: Internationalization supported

                    [DESCRIPTION <description>] # Note: Internationalization supported

                    [UPDATE_TEXT <update_text>]

                    [VERSION <version>]

                    [RELEASE_DATE <release_date>]

                    [SCRIPT <script>]

                    [PRIORITY|SORTING_PRIORITY <sorting_priority>] # Note: PRIORITY is deprecated

                    [DEPENDS|DEPENDENCIES <com_id> ...]

                    [AUTO_DEPEND_ON <comp_id> ...]

                    [LICENSES <display_name> <file_path> ...]

                    [DEFAULT <value>]

                    [USER_INTERFACES <file_path> <file_path> ...]

                    [TRANSLATIONS <file_path> <file_path> ...]

                    [REPLACES <comp_id> ...]

                    [CHECKABLE <value>])
```

This command should be called after cpack_add_component() <#command:cpack_add_component> command.

COMMON

if set, then the component will be packaged and installed as part of a group to which it belongs.

ESSENTIAL

Added in version 3.6.

if set, then the package manager stays disabled until that component is updated.

VIRTUAL

Added in version 3.8.

if set, then the component will be hidden from the installer. It is a equivalent of the HIDDEN option from the cpack_add_component() <#command:cpack_add_component> command.

FORCED_INSTALLATION

Added in version 3.8.

if set, then the component must always be installed. It is a equivalent of the REQUIRED option from the cpack_add_component() <#command:cpack_add_component> command.

REQUIRES_ADMIN_RIGHTS

Added in version 3.8.

set it if the component needs to be installed with elevated permissions.

NAME

is used to create domain-like identification for this component. By default used origin component name.

DISPLAY_NAME

Added in version 3.8.

set to rewrite original name configured by cpack_add_component() <#command:cpack_add_component> command.

DESCRIPTION

Added in version 3.8.

set to rewrite original description configured by cpack_add_component() <#command:cpack_add_component> command.

UPDATE_TEXT

Added in version 3.8.

will be added to the component description if this is an update to the component.

VERSION

is version of component. By default used CPACK_PACKAGE_VERSION <#variable:CPACK_PACKAGE_VERSION>.

RELEASE_DATE

Added in version 3.8.

keep empty to auto generate.

SCRIPT

is a relative or absolute path to operations script for this component.

SORTING_PRIORITY

Added in version 3.8.

is priority of the component in the tree.

PRIORITY

Deprecated since version 3.8: Old name for SORTING_PRIORITY.

DEPENDS, DEPENDENCIES

Added in version 3.8.

list of dependency component or component group identifiers in QtIFW style.

Added in version 3.21.

Component or group names listed as dependencies may contain hyphens. This requires QtIFW 3.1 or later.

AUTO_DEPEND_ON

Added in version 3.8.

list of identifiers of component or component group in QtIFW style that this component has an automatic dependency on.

LICENSES

pair of <display_name> and <file_path> of license text for this component. You can specify more then one license.

DEFAULT

Added in version 3.8.

Possible values are: TRUE, FALSE, and SCRIPT. Set to FALSE to disable the component in the installer or to SCRIPT to resolved during runtime (don't forget add the file of the script as a value of the SCRIPT option).

USER_INTERFACES

Added in version 3.7.

is a list of <file_path> ('.ui' files) representing pages to load.

TRANSLATIONS

Added in version 3.8.

is a list of <file_path> ('.qm' files) representing translations to load.

REPLACES

Added in version 3.10.

list of identifiers of component or component group to replace.

CHECKABLE

Added in version 3.10.

Possible values are: TRUE, FALSE. Set to FALSE if you want to hide the checkbox for an item. This is useful when only a few subcomponents should be selected instead of all.

cpack_ifw_configure_component_group

Sets the arguments specific to the CPack IFW generator.

```
cpack_ifw_configure_component_group(<groupname> [VIRTUAL]

                    [FORCED_INSTALLATION] [REQUIRES_ADMIN_RIGHTS]

                    [NAME <name>]

                    [DISPLAY_NAME <display_name>] # Note: Internationalization supported

                    [DESCRIPTION <description>] # Note: Internationalization supported

                    [UPDATE_TEXT <update_text>]

                    [VERSION <version>]

                    [RELEASE_DATE <release_date>]

                    [SCRIPT <script>]

                    [PRIORITY|SORTING_PRIORITY <sorting_priority>] # Note: PRIORITY is deprecated

                    [DEPENDS|DEPENDENCIES <com_id> ...]

                    [AUTO_DEPEND_ON <comp_id> ...]

                    [LICENSES <display_name> <file_path> ...]

                    [DEFAULT <value>]

                    [USER_INTERFACES <file_path> <file_path> ...]

                    [TRANSLATIONS <file_path> <file_path> ...]

                    [REPLACES <comp_id> ...]

                    [CHECKABLE <value>])
```

This command should be called after cpack_add_component_group() <#command:cpack_add_component_group> command.

VIRTUAL

Added in version 3.8.

if set, then the group will be hidden from the installer. Note that setting this on a root component does not work.

FORCED_INSTALLATION

Added in version 3.8.

if set, then the group must always be installed.

REQUIRES_ADMIN_RIGHTS

Added in version 3.8.

set it if the component group needs to be installed with elevated permissions.

NAME

is used to create domain-like identification for this component group. By default used origin component group name.

DISPLAY_NAME

Added in version 3.8.

set to rewrite original name configured by cpack_add_component_group() <#command:cpack_add_component_group> command.

DESCRIPTION

Added in version 3.8.

set to rewrite original description configured by cpack_add_component_group() <#command:cpack_add_component_group> command.

UPDATE_TEXT

Added in version 3.8.

will be added to the component group description if this is an update to the component group.

VERSION

is version of component group. By default used CPACK_PACKAGE_VERSION <#variable:CPACK_PACKAGE_VERSION>.

RELEASE_DATE

Added in version 3.8.

keep empty to auto generate.

SCRIPT

is a relative or absolute path to operations script for this component group.

SORTING_PRIORITY

is priority of the component group in the tree.

PRIORITY

Deprecated since version 3.8: Old name for SORTING_PRIORITY.

DEPENDS, DEPENDENCIES

Added in version 3.8.

list of dependency component or component group identifiers in QtIFW style.

Added in version 3.21.

Component or group names listed as dependencies may contain hyphens. This requires QtIFW 3.1 or later.

AUTO_DEPEND_ON

Added in version 3.8.

list of identifiers of component or component group in QtIFW style that this component group has an automatic dependency on.

LICENSES

pair of <display_name> and <file_path> of license text for this component group. You can specify more then one license.

DEFAULT

Added in version 3.8.

Possible values are: TRUE, FALSE, and SCRIPT. Set to TRUE to preselect the group in the installer (this takes effect only on groups that have no visible child components) or to SCRIPT to resolved during runtime (don't forget add the file of the script as a value of the SCRIPT option).

USER_INTERFACES

Added in version 3.7.

is a list of <file_path> ('.ui' files) representing pages to load.

TRANSLATIONS

Added in version 3.8.

is a list of <file_path> ('.qm' files) representing translations to load.

REPLACES

Added in version 3.10.

list of identifiers of component or component group to replace.

CHECKABLE

Added in version 3.10.

Possible values are: TRUE, FALSE. Set to FALSE if you want to hide the checkbox for an item. This is useful when only a few subcomponents should be selected instead of all.

cpack_ifw_add_repository

Add QtIFW specific remote repository to binary installer.

```
cpack_ifw_add_repository(<reponame> [DISABLED]

                    URL <url>

                    [USERNAME <username>]

                    [PASSWORD <password>]

                    [DISPLAY_NAME <display_name>])
```

This command will also add the <reponame> repository to a variable CPACK_IFW_REPOSITORIES_ALL <#variable:CPACK_IFW_REPOSITORIES_ALL>.

DISABLED

if set, then the repository will be disabled by default.

URL

is points to a list of available components.

USERNAME

is used as user on a protected repository.

PASSWORD

is password to use on a protected repository.

DISPLAY_NAME

is string to display instead of the URL.

cpack_ifw_update_repository

Added in version 3.6.

Update QtIFW specific repository from remote repository.

```
cpack_ifw_update_repository(<reponame>

                    [[ADD|REMOVE] URL <url>]|

                     [REPLACE OLD_URL <old_url> NEW_URL <new_url>]]

                    [USERNAME <username>]

                    [PASSWORD <password>]

                    [DISPLAY_NAME <display_name>])
```

This command will also add the <reponame> repository to a variable CPACK_IFW_REPOSITORIES_ALL <#variable:CPACK_IFW_REPOSITORIES_ALL>.

URL

is points to a list of available components.

OLD_URL

is points to a list that will replaced.

NEW_URL

is points to a list that will replace to.

USERNAME

is used as user on a protected repository.

PASSWORD

is password to use on a protected repository.

DISPLAY_NAME

is string to display instead of the URL.

cpack_ifw_add_package_resources

Added in version 3.7.

Add additional resources in the installer binary.

```
cpack_ifw_add_package_resources(<file_path> <file_path> ...)
```

This command will also add the specified files to a variable CPACK_IFW_PACKAGE_RESOURCES <#variable:CPACK_IFW_PACKAGE_RESOURCES>.

### CPackIFWConfigureFile
Added in version 3.8.

This module provides a command similar to configure_file() <#command:configure_file> for configuring file templates prepared in QtIFW/SDK/Creator style.

Load this module in a CMake project with:

```
include(CPackIFWConfigureFile)
```

### Commands
This module provides the following command:

cpack_ifw_configure_file

Copies a file template to output file and substitutes variable values referenced as %{VAR} or %VAR% from the input file template content:

```
cpack_ifw_configure_file(<input> <output>)
```

<input>

Input file template. If given as a relative path, it is interpreted as relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

<output>

Output file. If given as a relative path, it is interpreted as relative to the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>).

Qt Installer Framework (QtIFW) uses @ characters for embedding predefined variables (TargetDir, StartMenuDir, etc.) in Qt installer scripts:

example.qs

```
component.addOperation(

  "CreateShortcut",

  "@TargetDir@/example.com.html",

  "@StartMenuDir@/Example Web Site.lnk"
);
```

The purpose of this command is to preserve the QtIFW predefined variables containing the @ characters (@VAR@), and instead use the % characters for template placeholders (%VAR%, %{VAR}) in Qt/IFW/SDK/Creator templates. The configure_file() <#command:configure_file> command would otherwise replace all variable references containing the @ characters.

Each variable reference will be replaced with the current value of the variable, or the empty string if the variable is not defined.

### Examples
In the following example this module is used to create an IFW component script from a given template file qt.tools.foo.qs.in, where %FOO_DOC_DIR% variable reference will be replaced by the values of the FOO_DOC_DIR CMake variable.

CMakeLists.txt

```
cmake_minimum_required(VERSION 3.8)
project(Foo)
# ...
include(CPackIFWConfigureFile)
set(FOO_DOC_DIR "doc/foo")
cpack_ifw_configure_file(qt.tools.foo.qs.in qt.tools.foo.qs)
```

qt.tools.foo.qs.in

```
function Component()
{
}
Component.prototype.createOperations = function()
{

  if (installer.value("os") === "win") {

    component.addOperation(

      "CreateShortcut",

      "@TargetDir@/%FOO_DOC_DIR%/example.com.html",

      "@StartMenuDir@/Example Web Site.lnk"

    );

  }

  component.createOperations();
}
// ...
```

### See Also

- The CPack IFW Generator <#cpack_gen:CPack IFW Generator>.

- The CPackIFW <#module:CPackIFW> module.

### CSharpUtilities
Added in version 3.8.

This utility module is intended to simplify the configuration of CSharp/.NET targets and provides a collection of commands for managing CSharp targets with Visual Studio Generators <#visual-studio-generators>, version 2010 and newer.

Load this module in a CMake project with:

```
include(CSharpUtilities)
```

### Commands
This module provides the following commands:

Main Commands

- csharp_set_windows_forms_properties()

- csharp_set_designer_cs_properties()

- csharp_set_xaml_cs_properties()

Helper Commands

- csharp_get_filename_keys()

- csharp_get_filename_key_base()

- csharp_get_dependentupon_name()

### Main Commands
csharp_set_windows_forms_properties

Sets source file properties for use of Windows Forms:

```
csharp_set_windows_forms_properties([<files>...])
```

<files>...

A list of zero or more source files which are relevant for setting the VS_CSHARP_<tagname> <#prop_sf:VS_CSHARP_<tagname>> source file properties. This typically includes files with .cs, .resx, and .Designer.cs extensions.

Use this command when a CSharp target in the project uses Windows Forms.

This command searches in the provided list of files for pairs of related files ending with .Designer.cs (designer files) or .resx (resource files). For each such file, a corresponding base .cs file is searched (with the same base name). When found, the VS_CSHARP_<tagname> <#prop_sf:VS_CSHARP_<tagname>> source file properties are set as follows:

For the .cs file:

•

VS_CSHARP_SubType "Form"

For the .Designer.cs file (if it exists):

- VS_CSHARP_DependentUpon <cs-filename>

- VS_CSHARP_DesignTime "" (tag is removed if previously defined)

- VS_CSHARP_AutoGen "" (tag is removed if previously defined)

For the .resx file (if it exists):

- VS_RESOURCE_GENERATOR "" (tag is removed if previously defined)

- VS_CSHARP_DependentUpon <cs-filename>

- VS_CSHARP_SubType "Designer"

csharp_set_designer_cs_properties

Sets source file properties for .Designer.cs files depending on sibling filenames:

```
csharp_set_designer_cs_properties([<files>...])
```

<files>...

A list of zero or more source files which are relevant for setting the VS_CSHARP_<tagname> <#prop_sf:VS_CSHARP_<tagname>> source file properties. This typically includes files with .resx, .settings, and .Designer.cs extensions.

Use this command, if the CSharp target does not use Windows Forms (for Windows Forms use csharp_set_windows_forms_properties() instead).

This command searches through the provided list for files ending in .Designer.cs (designer files). For each such file, it looks for sibling files with the same base name but different extensions. If a matching file is found, the appropriate source file properties are set on the corresponding .Designer.cs file based on the matched extension:

If match is .resx file:

- VS_CSHARP_AutoGen "True"

- VS_CSHARP_DesignTime "True"

- VS_CSHARP_DependentUpon <resx-filename>

If match is .cs file:

•

VS_CSHARP_DependentUpon <cs-filename>

If match is .settings file:

- VS_CSHARP_AutoGen "True"

- VS_CSHARP_DesignTimeSharedInput "True"

- VS_CSHARP_DependentUpon <settings-filename>

Note:

Because the source file properties of the .Designer.cs file are set according to the found matches and every match sets the VS_CSHARP_DependentUpon <#prop_sf:VS_CSHARP_<tagname>> source file property, there should only be one match for each Designer.cs file.

csharp_set_xaml_cs_properties

Sets source file properties for use of Windows Presentation Foundation (WPF) and XAML:

```
csharp_set_xaml_cs_properties([<files>...])
```

Use this command, if the CSharp target uses WPF/XAML.

<files>...

A list of zero or more source files which are relevant for setting the VS_CSHARP_<tagname> <#prop_sf:VS_CSHARP_<tagname>> source file properties. This typically includes files with .cs, .xaml, and .xaml.cs extensions.

This command searches the provided file list for files ending with .xaml.cs. For each such XAML code-behind file, a corresponding .xaml file with the same base name is searched. If found, the following source file property is set on the .xaml.cs file:

•

VS_CSHARP_DependentUpon <xaml-filename>

### Helper Commands
These commands are used by the above main commands and typically aren't used directly:

csharp_get_filename_keys

Computes a normalized list of key values to identify source files independently of relative or absolute paths given in CMake and eliminates case sensitivity:

```
csharp_get_filename_keys(<variable> [<files>...])
```

<variable>

Name of the variable in which the list of computed keys is stored.

<files>...

Zero or more source file paths as given to CSharp target using commands like add_library() <#command:add_library>, or add_executable() <#command:add_executable>.

This command canonicalizes file paths to ensure consistent identification of source files. This is useful when source files are added to a target using different path forms. Without normalization, CMake may treat paths like myfile.Designer.cs and ${CMAKE_CURRENT_SOURCE_DIR}/myfile.Designer.cs as different files, which can cause issues when setting source file properties.

For example, the following code will fail to set properties because the file paths do not match exactly:

```
add_library(lib myfile.cs ${CMAKE_CURRENT_SOURCE_DIR}/myfile.Designer.cs)
set_source_files_properties(

  myfile.Designer.cs

  PROPERTIES VS_CSHARP_DependentUpon myfile.cs
)
```

csharp_get_filename_key_base

Returns the full filepath and name without extension of a key:

```
csharp_get_filename_key_base(<base> <key>)
```

<base>

Name of the variable with the computed base value of the <key> without the file extension.

<key>

The key of which the base will be computed. Expected to be a uppercase full filename from csharp_get_filename_keys().

csharp_get_dependentupon_name

Computes a string which can be used as value for the source file property VS_CSHARP_<tagname> <#prop_sf:VS_CSHARP_<tagname>> with <tagname> being DependentUpon:

```
csharp_get_dependentupon_name(<variable> <file>)
```

<variable>

Name of the variable with the result value. Value contains the name of the <file> without directory.

<file>

Filename to convert for using in the value of the VS_CSHARP_DependentUpon source file property.

### CTest
Configure a project for testing with CTest/CDash

Include this module in the top CMakeLists.txt file of a project to enable testing with CTest and dashboard submissions to CDash:

```
project(MyProject)
...
include(CTest)
```

The module automatically creates the following variables:

BUILD_TESTING <#variable:BUILD_TESTING>

Option selecting whether include(CTest) calls enable_testing() <#command:enable_testing>. The option is ON by default when created by the module.

After including the module, use code like:

```
if(BUILD_TESTING)

  # ... CMake code to create tests ...
endif()
```

to creating tests when testing is enabled.

To enable submissions to a CDash server, create a CTestConfig.cmake file at the top of the project with content such as:

```
set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC")
set(CTEST_SUBMIT_URL "http://my.cdash.org/submit.php?project=MyProject")
```

The CDash server can provide the file to a project administrator who configures MyProject. Settings in the config file are shared by both this CTest module and the ctest(1) <#manual:ctest(1)> command-line Dashboard Client <#dashboard-client> mode (ctest -S <#cmdoption-ctest-S>).

While building a project for submission to CDash, CTest scans the build output for errors and warnings and reports them with surrounding context from the build log. This generic approach works for all build tools, but does not give details about the command invocation that produced a given problem. One may get more detailed reports by setting the CTEST_USE_LAUNCHERS <#variable:CTEST_USE_LAUNCHERS> variable:

```
set(CTEST_USE_LAUNCHERS 1)
```

in the CTestConfig.cmake file.

### CTestCoverageCollectGCOV
Added in version 3.2.

This module is intended for use in CTest dashboard scripts and provides a command to generate a tarball containing code coverage reports.

Load this module in a CTest script with:

```
include(CTestCoverageCollectGCOV)
```

### Commands
This module provides the following command:

ctest_coverage_collect_gcov

Runs gcov and packages a tar file for CDash:

```
ctest_coverage_collect_gcov(

  TARBALL <tar-file>

  [TARBALL_COMPRESSION <compression>]

  [SOURCE <source-dir>]

  [BUILD <build-dir>]

  [GCOV_COMMAND <gcov-command>]

  [GCOV_OPTIONS <options>...]

  [GLOB]

  [DELETE]

  [QUIET]
)
```

This command runs gcov on all .gcda files found in the binary tree and packages the resulting .gcov files into a tar file, along with the following:

- data.json file that defines the source and build directories for use by CDash.

- Labels.json files that indicate any LABELS <#prop_sf:LABELS> that have been set on the source files.

- The uncovered directory containing any uncovered files found by CTEST_EXTRA_COVERAGE_GLOB <#variable:CTEST_EXTRA_COVERAGE_GLOB>.

The resulting tar file can be submitted to CDash for display using the ctest_submit(CDASH_UPLOAD) <#command:ctest_submit> command.

The arguments are:

TARBALL <tar-file>

Specify the location of the .tar file to be created for later upload to CDash. Relative paths will be interpreted with respect to the top-level build directory.

TARBALL_COMPRESSION <compression>

Added in version 3.18.

Specify a compression algorithm for the TARBALL data file. Using this option reduces the size of the data file before it is submitted to CDash. <compression> should be one of the following:

- GZIP

- BZIP2

- LZMA Added in version 4.3.

- LZMA2 Added in version 4.3.

This is an alias for XZ.

- XZ

- ZSTD

- FROM_EXT

- An expression that CMake evaluates as FALSE

The default value is BZIP2.

If FROM_EXT is specified, the resulting file will be compressed based on the file extension of the <tar-file> (i.e. .tar.gz will use GZIP compression). File extensions that will produce compressed output include:

- .tar.gz

- .tgz

- .tar.bzip2

- .tbz

- .tar.xz

- .txz

- .tar.lzma Added in version 4.3.

- .tlzma Added in version 4.3.

- .tar.zst Added in version 4.3.

- .tzst Added in version 4.3.

SOURCE <source-dir>

Specify the top-level source directory for the build. Default is the value of CTEST_SOURCE_DIRECTORY <#variable:CTEST_SOURCE_DIRECTORY>.

BUILD <build-dir>

Specify the top-level build directory for the build. Default is the value of CTEST_BINARY_DIRECTORY <#variable:CTEST_BINARY_DIRECTORY>.

GCOV_COMMAND <gcov-command>

Specify the full path to the gcov command on the machine. Default is the value of CTEST_COVERAGE_COMMAND <#variable:CTEST_COVERAGE_COMMAND>.

GCOV_OPTIONS <options>...

Specify options to be passed to gcov. The gcov command is run as gcov <options>... -o <gcov-dir> <file>.gcda. If not specified, the default option is just -b -x.

GLOB

Added in version 3.6.

Recursively search for .gcda files in <build-dir> rather than determining search locations by reading CMakeFiles/TargetDirectories.txt (file generated by CMake at the generation phase).

DELETE

Added in version 3.6.

Delete coverage files after they've been packaged into the .tar.

QUIET

Suppress non-error messages that otherwise would have been printed out by this command.

Added in version 3.3: Added support for the CTEST_CUSTOM_COVERAGE_EXCLUDE <#variable:CTEST_CUSTOM_COVERAGE_EXCLUDE> variable.

### Examples
Generating code coverage data packaged as a .tar.gz file in a ctest -S <#cmdoption-ctest-S> script:

script.cmake

```
include(CTestCoverageCollectGCOV)
ctest_coverage_collect_gcov(

  TARBALL "${CTEST_BINARY_DIRECTORY}/gcov.tar.gz"

  TARBALL_COMPRESSION "GZIP"
)
```

### CTestUseLaunchers
This module sets the RULE_LAUNCH_* global properties when the CTEST_USE_LAUNCHERS <#variable:CTEST_USE_LAUNCHERS> variable is set to a true-like value (e.g., ON):

- RULE_LAUNCH_COMPILE <#prop_gbl:RULE_LAUNCH_COMPILE>

- RULE_LAUNCH_CUSTOM <#prop_gbl:RULE_LAUNCH_CUSTOM>

- RULE_LAUNCH_LINK <#prop_gbl:RULE_LAUNCH_LINK>

Load this module in a CMake project with:

```
include(CTestUseLaunchers)
```

The CTestUseLaunchers module is automatically included by the CTest <#module:CTest> module when include(CTest) is called. However, it is provided as a separate module so that projects can use the CTEST_USE_LAUNCHERS functionality independently.

To use launchers, set the CTEST_USE_LAUNCHERS variable to a true-like value in a ctest -S <#cmdoption-ctest-S> dashboard script, and then also set the CTEST_USE_LAUNCHERS cache variable in the configured project. Both cmake and ctest must be aware of its value for the launchers to function correctly:

- cmake needs it to generate the appropriate build rules

- ctest requires it for accurate error and warning analysis

For convenience, the environment variable CTEST_USE_LAUNCHERS_DEFAULT <#envvar:CTEST_USE_LAUNCHERS_DEFAULT> may be set in the ctest -S <#cmdoption-ctest-S> script. Then, as long as the CMakeLists.txt includes the CTest or CTestUseLaunchers module, it will use the value of the environment variable to initialize a CTEST_USE_LAUNCHERS cache variable. This cache variable initialization only occurs if CTEST_USE_LAUNCHERS is not already defined.

Added in version 3.8: If CTEST_USE_LAUNCHERS is set to a true-like value in a ctest -S <#cmdoption-ctest-S> script, the ctest_configure() <#command:ctest_configure> command will add -DCTEST_USE_LAUNCHERS:BOOL=TRUE to the cmake command when configuring the project.

### Examples

```
set(CTEST_USE_LAUNCHERS ON)
include(CTestUseLaunchers)
```

### DeployQt4
Note:

This module is for Qt version 4. New code should follow the cmake-qt(7) <#manual:cmake-qt(7)> instead of using this module.

This module provides a collection of CMake utility commands useful for assembling and deploying standalone Qt4 executables.

Load this module in a CMake project with:

```
include(DeployQt4)
```

### Commands
This module provides the following commands:

- write_qt4_conf()

- resolve_qt4_paths()

- fixup_qt4_executable()

- install_qt4_plugin_path()

- install_qt4_plugin()

- install_qt4_executable()

write_qt4_conf

Creates a Qt configuration file:

```
write_qt4_conf(<qt-conf-dir> <qt-conf-contents>)
```

This command writes a qt.conf file with the <qt-conf-contents> into the <qt-conf-dir> directory.

resolve_qt4_paths

Resolves relative paths to absolute:

```
resolve_qt4_paths(<paths-var> [<executable-path>])
```

This command loops through the <paths-var> list and if any path doesn't exist, it resolves them relative to the <executable-path> (if supplied) or the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX>.

fixup_qt4_executable

Fixes up a Qt4 executable:

```
fixup_qt4_executable(

  <executable>

  [<qtplugins> <libs> <dirs> <plugins-dir> <request-qt-conf>]
)
```

This command copies Qt plugins, writes a Qt configuration file (if needed) and fixes up a Qt4 executable using the BundleUtilities <#module:BundleUtilities> module so it is standalone and can be drag-and-drop copied to another machine as long as all of the system libraries are compatible.

<executable> should point to the executable to be fixed-up.

<qtplugins> should contain a list of the names or paths of any Qt plugins to be installed.

<libs> will be passed to the BundleUtilities <#module:BundleUtilities> module and should be a list of any already installed plugins, libraries or executables to also be fixed-up.

<dirs> will be passed to the BundleUtilities <#module:BundleUtilities> module and should contain directories to be searched to find library dependencies.

<plugins-dir> allows a custom plugins directory to be used.

<request-qt-conf> will force a qt.conf file to be written even if not needed.

install_qt4_plugin_path

Installs a resolved Qt4 plugin:

```
install_qt4_plugin_path(

  <plugin>

  <executable>

  <copy>

  <installed-plugin-path-var>

  [<plugins-dir> <component> <configurations>]
)
```

This command installs (or copies) a resolved <plugin> to the default plugins directory (or <plugins-dir>) relative to <executable> and stores the result in a variable <installed-plugin-path-var>.

If <copy> is set to TRUE then the plugins will be copied rather than installed. This is to allow this module to be used at CMake time rather than install time.

If <component> is set then anything installed will use this COMPONENT.

install_qt4_plugin

Installs an unresolved Qt4 plugin:

```
install_qt4_plugin(

  <plugin>

  <executable>

  <copy>

  <installed-plugin-path-var>

  [<plugins-dir> <component>]
)
```

This command installs (or copies) an unresolved <plugin> to the default plugins directory (or <plugins-dir>) relative to <executable> and stores the result in a variable <installed-plugin-path-var>. For other arguments, see also install_qt4_plugin_path().

install_qt4_executable

Installs Qt plugins, writes a Qt configuration file (if needed) and fixes up a Qt4 executable:

```
install_qt4_executable(

  <executable>

  [<qtplugins> <libs> <dirs> <plugins-dir> <request-qt-conf> <component>]
)
```

This command uses the BundleUtilities <#module:BundleUtilities> module so executable is standalone and can be drag-and-drop copied to another machine as long as all of the system libraries are compatible. The executable will be fixed-up at install time. The <component> is the COMPONENT used for bundle fixup and plugin installation. For other arguments, see also fixup_qt4_executable().

### ExternalData
This module provides commands to manage data files stored outside source tree.

Load this module in a CMake project with:

```
include(ExternalData)
```

### Introduction
Use this module to unambiguously reference data files stored outside the source tree and fetch them at build time from arbitrary local and remote content-addressed locations. Functions provided by this module recognize arguments with the syntax DATA{<name>} as references to external data, replace them with full paths to local copies of those data, and create build rules to fetch and update the local copies.

For example:

```
include(ExternalData)
set(ExternalData_URL_TEMPLATES "file:///local/%(algo)/%(hash)"

                               "file:////host/share/%(algo)/%(hash)"

                               "http://data.org/%(algo)/%(hash)")
ExternalData_Add_Test(MyData

  NAME MyTest

  COMMAND MyExe DATA{MyInput.png}

  )
ExternalData_Add_Target(MyData)
```

When test MyTest runs the DATA{MyInput.png} argument will be replaced by the full path to a real instance of the data file MyInput.png on disk. If the source tree contains a content link such as MyInput.png.md5 then the MyData target creates a real MyInput.png in the build tree.

### Module Functions
ExternalData_Expand_Arguments

The ExternalData_Expand_Arguments function evaluates DATA{} references in its arguments and constructs a new list of arguments:

```
ExternalData_Expand_Arguments(

  <target>   # Name of data management target

  <outVar>   # Output variable

  [args...]  # Input arguments, DATA{} allowed

  )
```

It replaces each DATA{} reference in an argument with the full path of a real data file on disk that will exist after the <target> builds.

ExternalData_Add_Test

The ExternalData_Add_Test function wraps around the CMake add_test() <#command:add_test> command but supports DATA{} references in its arguments:

```
ExternalData_Add_Test(

  <target>   # Name of data management target

  ...        # Arguments of add_test(), DATA{} allowed

  )
```

It passes its arguments through ExternalData_Expand_Arguments and then invokes the add_test() <#command:add_test> command using the results.

Changed in version 3.31: If the arguments after <target> define a test with an executable that is a CMake target, empty values in the TEST_LAUNCHER <#prop_tgt:TEST_LAUNCHER> and CROSSCOMPILING_EMULATOR <#prop_tgt:CROSSCOMPILING_EMULATOR> properties of that target are preserved. See policy CMP0178 <#policy:CMP0178>.

ExternalData_Add_Target

The ExternalData_Add_Target function creates a custom target to manage local instances of data files stored externally:

```
ExternalData_Add_Target(

  <target>                  # Name of data management target

  [SHOW_PROGRESS <ON|OFF>]  # Show progress during the download

  )
```

It creates custom commands in the target as necessary to make data files available for each DATA{} reference previously evaluated by other functions provided by this module. Data files may be fetched from one of the URL templates specified in the ExternalData_URL_TEMPLATES variable, or may be found locally in one of the paths specified in the ExternalData_OBJECT_STORES variable.

Added in version 3.20: The SHOW_PROGRESS argument may be passed to suppress progress information during the download of objects. If not provided, it defaults to OFF for Ninja <#generator:Ninja> and Ninja Multi-Config <#generator:Ninja Multi-Config> generators and ON otherwise.

Typically only one target is needed to manage all external data within a project. Call this function once at the end of configuration after all data references have been processed.

### Module Variables
The following variables configure behavior. They should be set before calling any of the functions provided by this module.

ExternalData_BINARY_ROOT

The ExternalData_BINARY_ROOT variable may be set to the directory to hold the real data files named by expanded DATA{} references. The default is CMAKE_BINARY_DIR. The directory layout will mirror that of content links under ExternalData_SOURCE_ROOT.

ExternalData_CUSTOM_SCRIPT_<key>

Added in version 3.2.

Specify a full path to a .cmake custom fetch script identified by <key> in entries of the ExternalData_URL_TEMPLATES list. See Custom Fetch Scripts.

ExternalData_HTTPHEADERS

Added in version 4.0.

The ExternalData_HTTPHEADERS variable may be used to supply a list of headers, each element containing one header with the form Key: Value. See the file(DOWNLOAD) <#download> command's HTTPHEADER option.

ExternalData_LINK_CONTENT

The ExternalData_LINK_CONTENT variable may be set to the name of a supported hash algorithm to enable automatic conversion of real data files referenced by the DATA{} syntax into content links. For each such <file> a content link named <file><ext> is created. The original file is renamed to the form .ExternalData_<algo>_<hash> to stage it for future transmission to one of the locations in the list of URL templates (by means outside the scope of this module). The data fetch rule created for the content link will use the staged object if it cannot be found using any URL template.

ExternalData_NO_SYMLINKS

Added in version 3.3.

The real data files named by expanded DATA{} references may be made available under ExternalData_BINARY_ROOT using symbolic links on some platforms. The ExternalData_NO_SYMLINKS variable may be set to disable use of symbolic links and enable use of copies instead.

ExternalData_OBJECT_STORES

The ExternalData_OBJECT_STORES variable may be set to a list of local directories that store objects using the layout <dir>/%(algo)/%(hash). These directories will be searched first for a needed object. If the object is not available in any store then it will be fetched remotely using the URL templates and added to the first local store listed. If no stores are specified the default is a location inside the build tree.

ExternalData_SERIES_PARSE

ExternalData_SERIES_PARSE_PREFIX

ExternalData_SERIES_PARSE_NUMBER

ExternalData_SERIES_PARSE_SUFFIX

ExternalData_SERIES_MATCH

See Referencing File Series.

ExternalData_SOURCE_ROOT

The ExternalData_SOURCE_ROOT variable may be set to the highest source directory containing any path named by a DATA{} reference. The default is CMAKE_SOURCE_DIR. ExternalData_SOURCE_ROOT and CMAKE_SOURCE_DIR must refer to directories within a single source distribution (e.g. they come together in one tarball).

ExternalData_TIMEOUT_ABSOLUTE

The ExternalData_TIMEOUT_ABSOLUTE variable sets the download absolute timeout, in seconds, with a default of 300 seconds. Set to 0 to disable enforcement.

ExternalData_TIMEOUT_INACTIVITY

The ExternalData_TIMEOUT_INACTIVITY variable sets the download inactivity timeout, in seconds, with a default of 60 seconds. Set to 0 to disable enforcement.

ExternalData_URL_ALGO_<algo>_<key>

Added in version 3.3.

Specify a custom URL component to be substituted for URL template placeholders of the form %(algo:<key>), where <key> is a valid C identifier, when fetching an object referenced via hash algorithm <algo>. If not defined, the default URL component is just <algo> for any <key>.

ExternalData_URL_TEMPLATES

The ExternalData_URL_TEMPLATES may be set to provide a list of URL templates using the placeholders %(algo) and %(hash) in each template. Data fetch rules try each URL template in order by substituting the hash algorithm name for %(algo) and the hash value for %(hash). Alternatively one may use %(algo:<key>) with ExternalData_URL_ALGO_<algo>_<key> variables to gain more flexibility in remote URLs.

### Referencing Single Files
The DATA{} syntax is literal and the <name> is a full or relative path within the source tree. The source tree must contain either a real data file at <name> or a "content link" at <name><ext> containing a hash of the real file using a hash algorithm corresponding to <ext>. For example, the argument DATA{img.png} may be satisfied by either a real img.png file in the current source directory or a img.png.md5 file containing its MD5 sum.

Added in version 3.8: Multiple content links of the same name with different hash algorithms are supported (e.g. img.png.sha256 and img.png.sha1) so long as they all correspond to the same real file. This allows objects to be fetched from sources indexed by different hash algorithms.

### Referencing File Series
The DATA{} syntax can be told to fetch a file series using the form DATA{<name>,:}, where the : is literal. If the source tree contains a group of files or content links named like a series then a reference to one member adds rules to fetch all of them. Although all members of a series are fetched, only the file originally named by the DATA{} argument is substituted for it. The default configuration recognizes file series names ending with #.ext, _#.ext, .#.ext, or -#.ext where # is a sequence of decimal digits and .ext is any single extension. Configure it with a regex that parses <number> and <suffix> parts from the end of <name>:

ExternalData_SERIES_PARSE - regex of the form (<number>)(<suffix>)$.

For more complicated cases set:

- ExternalData_SERIES_PARSE - regex with at least two () groups.

- ExternalData_SERIES_PARSE_PREFIX - regex group number of the <prefix>, if any.

- ExternalData_SERIES_PARSE_NUMBER - regex group number of the <number>.

- ExternalData_SERIES_PARSE_SUFFIX - regex group number of the <suffix>.

Configure series number matching with a regex that matches the <number> part of series members named <prefix><number><suffix>:

ExternalData_SERIES_MATCH - regex matching <number> in all series members

Note that the <suffix> of a series does not include a hash-algorithm extension.

### Referencing Associated Files
The DATA{} syntax can alternatively match files associated with the named file and contained in the same directory. Associated files may be specified by options using the syntax DATA{<name>,<opt1>,<opt2>,...}. Each option may specify one file by name or specify a regular expression to match file names using the syntax REGEX:<regex>. For example, the arguments:

```
DATA{MyData/MyInput.mhd,MyInput.img}                   # File pair
DATA{MyData/MyFrames00.png,REGEX:MyFrames[0-9]+\\.png} # Series
```

will pass MyInput.mha and MyFrames00.png on the command line but ensure that the associated files are present next to them.

### Referencing Directories
The DATA{} syntax may reference a directory using a trailing slash and a list of associated files. The form DATA{<name>/,<opt1>,<opt2>,...} adds rules to fetch any files in the directory that match one of the associated file options. For example, the argument DATA{MyDataDir/,REGEX:.*} will pass the full path to a MyDataDir directory on the command line and ensure that the directory contains files corresponding to every file or content link in the MyDataDir source directory.

Added in version 3.3: In order to match associated files in subdirectories, specify a RECURSE: option, e.g. DATA{MyDataDir/,RECURSE:,REGEX:.*}.

### Hash Algorithms
The following hash algorithms are supported:

%(algo)

<ext>

Description

MD5

.md5

Message-Digest Algorithm 5, RFC 1321

SHA1

.sha1

US Secure Hash Algorithm 1, RFC 3174

SHA224

.sha224

US Secure Hash Algorithms, RFC 4634

SHA256

.sha256

US Secure Hash Algorithms, RFC 4634

SHA384

.sha384

US Secure Hash Algorithms, RFC 4634

SHA512

.sha512

US Secure Hash Algorithms, RFC 4634

SHA3_224

.sha3-224

Keccak SHA-3

SHA3_256

.sha3-256

Keccak SHA-3

SHA3_384

.sha3-384

Keccak SHA-3

SHA3_512

.sha3-512

Keccak SHA-3

Added in version 3.8: Added the SHA3_* hash algorithms.

Note that the hashes are used only for unique data identification and download verification.

### Custom Fetch Scripts
Added in version 3.2.

When a data file must be fetched from one of the URL templates specified in the ExternalData_URL_TEMPLATES variable, it is normally downloaded using the file(DOWNLOAD) <#download> command. One may specify usage of a custom fetch script by using a URL template of the form ExternalDataCustomScript://<key>/<loc>. The <key> must be a C identifier, and the <loc> must contain the %(algo) and %(hash) placeholders. A variable corresponding to the key, ExternalData_CUSTOM_SCRIPT_<key>, must be set to the full path to a .cmake script file. The script will be included to perform the actual fetch, and provided with the following variables:

ExternalData_CUSTOM_LOCATION

When a custom fetch script is loaded, this variable is set to the location part of the URL, which will contain the substituted hash algorithm name and content hash value.

ExternalData_CUSTOM_FILE

When a custom fetch script is loaded, this variable is set to the full path to a file in which the script must store the fetched content. The name of the file is unspecified and should not be interpreted in any way.

The custom fetch script is expected to store fetched content in the file or set a variable:

ExternalData_CUSTOM_ERROR

When a custom fetch script fails to fetch the requested content, it must set this variable to a short one-line message describing the reason for failure.

### ExternalProject
This module provides commands to download and build external projects as part of CMake build phase.

Load this module in a CMake project with:

```
include(ExternalProject)
```

### External Project Definition
ExternalProject_Add

The ExternalProject_Add() function creates a custom target to drive download, update/patch, configure, build, install and test steps of an external project:

```
ExternalProject_Add(<name> [<option>...])
```

The individual steps within the process can be driven independently if required (e.g. for CDash submission) and extra custom steps can be defined, along with the ability to control the step dependencies. The directory structure used for the management of the external project can also be customized. The function supports a large number of options which can be used to tailor the external project behavior.

### Directory Options
Most of the time, the default directory layout is sufficient. It is largely an implementation detail that the main project usually doesn't need to change. In some circumstances, however, control over the directory layout can be useful or necessary. The directory options are potentially more useful from the point of view that the main build can use the ExternalProject_Get_Property() command to retrieve their values, thereby allowing the main project to refer to build artifacts of the external project.

PREFIX <dir>

Root directory for the external project. Unless otherwise noted below, all other directories associated with the external project will be created under here.

TMP_DIR <dir>

Directory in which to store temporary files.

STAMP_DIR <dir>

Directory in which to store the timestamps of each step. Log files from individual steps are also created in here unless overridden by LOG_DIR (see Logging Options below).

LOG_DIR <dir>

Added in version 3.14.

Directory in which to store the logs of each step.

DOWNLOAD_DIR <dir>

Directory in which to store downloaded files before unpacking them. This directory is only used by the URL download method, all other download methods use SOURCE_DIR directly instead.

SOURCE_DIR <dir>

Source directory into which downloaded contents will be unpacked, or for non-URL download methods, the directory in which the repository should be checked out, cloned, etc. If no download method is specified, this must point to an existing directory where the external project has already been unpacked or cloned/checked out. Note:

If a download method is specified, any existing contents of the source directory may be deleted. Only the URL download method checks whether this directory is either missing or empty before initiating the download, stopping with an error if it is not empty. All other download methods silently discard any previous contents of the source directory.

BINARY_DIR <dir>

Specify the build directory location. This option is ignored if BUILD_IN_SOURCE is enabled.

INSTALL_DIR <dir>

Installation prefix to be placed in the <INSTALL_DIR> placeholder. This does not actually configure the external project to install to the given prefix. That must be done by passing appropriate arguments to the external project configuration step, e.g. using <INSTALL_DIR>.

If any of the above ..._DIR options are not specified, their defaults are computed as follows. If the PREFIX option is given or the EP_PREFIX directory property is set, then an external project is built and installed under the specified prefix:

```
TMP_DIR      = <prefix>/tmp
STAMP_DIR    = <prefix>/src/<name>-stamp
DOWNLOAD_DIR = <prefix>/src
SOURCE_DIR   = <prefix>/src/<name>
BINARY_DIR   = <prefix>/src/<name>-build
INSTALL_DIR  = <prefix>
LOG_DIR      = <STAMP_DIR>
```

Otherwise, if the EP_BASE directory property is set then components of an external project are stored under the specified base:

```
TMP_DIR      = <base>/tmp/<name>
STAMP_DIR    = <base>/Stamp/<name>
DOWNLOAD_DIR = <base>/Download/<name>
SOURCE_DIR   = <base>/Source/<name>
BINARY_DIR   = <base>/Build/<name>
INSTALL_DIR  = <base>/Install/<name>
LOG_DIR      = <STAMP_DIR>
```

If no PREFIX, EP_PREFIX, or EP_BASE is specified, then the default is to set PREFIX to <name>-prefix. Relative paths are interpreted with respect to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> at the point where ExternalProject_Add() is called.

### Download Step Options
A download method can be omitted if the SOURCE_DIR option is used to point to an existing non-empty directory. Otherwise, one of the download methods below must be specified (multiple download methods should not be given) or a custom DOWNLOAD_COMMAND provided.

DOWNLOAD_COMMAND <cmd>...

Overrides the command used for the download step (generator expressions <#manual:cmake-generator-expressions(7)> are supported). If this option is specified, all other download options will be ignored. Providing an empty string for <cmd> effectively disables the download step.

### URL
URL <url1> [<url2>...]

List of paths and/or URL(s) of the external project's source. When more than one URL is given, they are tried in turn until one succeeds. A URL may be an ordinary path in the local file system (in which case it must be the only URL provided) or any downloadable URL supported by the file(DOWNLOAD) <#download> command. A local filesystem path may refer to either an existing directory or to an archive file, whereas a URL is expected to point to a file which can be treated as an archive. When an archive is used, it will be unpacked automatically unless the DOWNLOAD_NO_EXTRACT option is set to prevent it. The archive type is determined by inspecting the actual content rather than using logic based on the file extension. Changed in version 3.7: Multiple URLs are allowed.

URL_HASH <algo>=<hashValue>

Hash of the archive file to be downloaded. The argument should be of the form <algo>=<hashValue> where algo can be any of the hashing algorithms supported by the file() <#command:file> command. Specifying this option is strongly recommended for URL downloads, as it ensures the integrity of the downloaded content. It is also used as a check for a previously downloaded file, allowing connection to the remote location to be avoided altogether if the local directory already has a file from an earlier download that matches the specified hash.

URL_MD5 <md5>

Equivalent to URL_HASH MD5=<md5>.

DOWNLOAD_NAME <fname>

File name to use for the downloaded file. If not given, the end of the URL is used to determine the file name. This option is rarely needed, the default name is generally suitable and is not normally used outside of code internal to the ExternalProject module.

DOWNLOAD_EXTRACT_TIMESTAMP <bool>

Added in version 3.24.

When specified with a true value, the timestamps of the extracted files will match those in the archive. When false, the timestamps of the extracted files will reflect the time at which the extraction was performed. If the download URL changes, timestamps based off those in the archive can result in dependent targets not being rebuilt when they potentially should have been. Therefore, unless the file timestamps are significant to the project in some way, use a false value for this option. If DOWNLOAD_EXTRACT_TIMESTAMP is not given, the default is false. See policy CMP0135 <#policy:CMP0135>.

DOWNLOAD_NO_EXTRACT <bool>

Added in version 3.6.

Allows the extraction part of the download step to be disabled by passing a boolean true value for this option. If this option is not given, the downloaded contents will be unpacked automatically if required. If extraction has been disabled, the full path to the downloaded file is available as <DOWNLOADED_FILE> in subsequent steps or as the property DOWNLOADED_FILE with the ExternalProject_Get_Property() command.

DOWNLOAD_NO_PROGRESS <bool>

Can be used to disable logging the download progress. If this option is not given, download progress messages will be logged.

TIMEOUT <seconds>

Maximum time allowed for file download operations.

INACTIVITY_TIMEOUT <seconds>

Added in version 3.19.

Terminate the operation after a period of inactivity.

HTTP_USERNAME <username>

Added in version 3.7.

Username for the download operation if authentication is required.

HTTP_PASSWORD <password>

Added in version 3.7.

Password for the download operation if authentication is required.

HTTP_HEADER <header1> [<header2>...]

Added in version 3.7.

Provides an arbitrary list of HTTP headers for the download operation. This can be useful for accessing content in systems like AWS, etc.

TLS_VERSION <min>

Added in version 3.30.

Specify minimum TLS version for https:// URLs. If this option is not provided, the value of the CMAKE_TLS_VERSION <#variable:CMAKE_TLS_VERSION> variable or the CMAKE_TLS_VERSION <#envvar:CMAKE_TLS_VERSION> environment variable will be used instead (see file(DOWNLOAD) <#download>).

This option also applies to git clone invocations, although the default behavior is different. If none of the TLS_VERSION option, CMAKE_TLS_VERSION <#variable:CMAKE_TLS_VERSION> variable, or CMAKE_TLS_VERSION <#envvar:CMAKE_TLS_VERSION> environment variable is specified, the behavior will be determined by git's default or a http.sslVersion git config option the user may have set at a global level.

TLS_VERIFY <bool>

Specifies whether certificate verification should be performed for https:// URLs. If this option is not provided, the value of the CMAKE_TLS_VERIFY <#variable:CMAKE_TLS_VERIFY> variable or the CMAKE_TLS_VERIFY <#envvar:CMAKE_TLS_VERIFY> environment variable will be used instead (see file(DOWNLOAD) <#download>). If neither of those is set, certificate verification will not be performed. In situations where URL_HASH cannot be provided, this option can be an alternative verification measure. This option also applies to git clone invocations, although the default behavior is different. If none of the TLS_VERIFY option, CMAKE_TLS_VERIFY <#variable:CMAKE_TLS_VERIFY> variable, or CMAKE_TLS_VERIFY <#envvar:CMAKE_TLS_VERIFY> environment variable is specified, the behavior will be determined by git's default (true) or a http.sslVerify git config option the user may have set at a global level.

Changed in version 3.6: Previously this option did not apply to git clone invocations.

Changed in version 3.30: Previously the CMAKE_TLS_VERIFY <#envvar:CMAKE_TLS_VERIFY> environment variable was not checked.

TLS_CAINFO <file>

Specify a custom certificate authority file to use if TLS_VERIFY is enabled. If this option is not specified, the value of the CMAKE_TLS_CAINFO <#variable:CMAKE_TLS_CAINFO> variable will be used instead (see file(DOWNLOAD) <#download>)

NETRC <level>

Added in version 3.11.

Specify whether the .netrc file is to be used for operation. If this option is not specified, the value of the CMAKE_NETRC <#variable:CMAKE_NETRC> variable will be used instead (see file(DOWNLOAD) <#download>). Valid levels are:

IGNORED

The .netrc file is ignored. This is the default.

OPTIONAL

The .netrc file is optional, and information in the URL is preferred. The file will be scanned to find which ever information is not specified in the URL.

REQUIRED

The .netrc file is required, and information in the URL is ignored.

NETRC_FILE <file>

Added in version 3.11.

Specify an alternative .netrc file to the one in your home directory if the NETRC level is OPTIONAL or REQUIRED. If this option is not specified, the value of the CMAKE_NETRC_FILE <#variable:CMAKE_NETRC_FILE> variable will be used instead (see file(DOWNLOAD) <#download>)

Added in version 3.1: Added support for tbz2, .tar.xz, .txz, and .7z extensions.

Added in version 4.1: All archive types that cmake -E tar <#cmdoption-cmake-E-arg-tar> can extract are supported regardless of file extension.

### Git
NOTE: A git version of 1.6.5 or later is required if this download method is used.

GIT_REPOSITORY <url>

URL of the git repository. Any URL understood by the git command may be used. Changed in version 3.27: A relative URL will be resolved based on the parent project's remote, subject to CMP0150 <#policy:CMP0150>. See the policy documentation for how the remote is selected, including conditions where the remote selection can fail. Local filesystem remotes should always use absolute paths.

GIT_TAG <tag>

Git branch name, tag or commit hash. Note that branch names and tags should generally be specified as remote names (i.e. origin/myBranch rather than simply myBranch). This ensures that if the remote end has its tag moved or branch rebased or history rewritten, the local clone will still be updated correctly. In general, however, specifying a commit hash should be preferred for a number of reasons:

- If the local clone already has the commit corresponding to the hash, no git fetch needs to be performed to check for changes each time CMake is re-run. This can result in a significant speed up if many external projects are being used.

- Using a specific git hash ensures that the main project's own history is fully traceable to a specific point in the external project's evolution. If a branch or tag name is used instead, then checking out a specific commit of the main project doesn't necessarily pin the whole build to a specific point in the life of the external project. The lack of such deterministic behavior makes the main project lose traceability and repeatability.

If GIT_SHALLOW is enabled then GIT_TAG works only with branch names and tags. A commit hash is not allowed.

Note that if not provided, GIT_TAG defaults to master, not the default Git branch name.

GIT_REMOTE_NAME <name>

The optional name of the remote. If this option is not specified, it defaults to origin.

GIT_SUBMODULES <module>...

Specific git submodules that should also be updated. If this option is not provided, all git submodules will be updated. Changed in version 3.16: When CMP0097 <#policy:CMP0097> is set to NEW, if this value is set to an empty string then no submodules are initialized or updated.

GIT_SUBMODULES_RECURSE <bool>

Added in version 3.17.

Specify whether git submodules (if any) should update recursively by passing the --recursive flag to git submodule update. If not specified, the default is on.

GIT_SHALLOW <bool>

Added in version 3.6.

When this option is enabled, the git clone operation will be given the --depth 1 option. This performs a shallow clone, which avoids downloading the whole history and instead retrieves just the commit denoted by the GIT_TAG option.

GIT_PROGRESS <bool>

Added in version 3.8.

When enabled, this option instructs the git clone operation to report its progress by passing it the --progress option. Without this option, the clone step for large projects may appear to make the build stall, since nothing will be logged until the clone operation finishes. While this option can be used to provide progress to prevent the appearance of the build having stalled, it may also make the build overly noisy if lots of external projects are used.

GIT_CONFIG <option1> [<option2>...]

Added in version 3.8.

Specify a list of config options to pass to git clone. Each option listed will be transformed into its own --config <option> on the git clone command line, with each option required to be in the form key=value.

GIT_REMOTE_UPDATE_STRATEGY <strategy>

Added in version 3.18.

When GIT_TAG refers to a remote branch, this option can be used to specify how the update step behaves. The <strategy> must be one of the following:

CHECKOUT

Ignore the local branch and always checkout the branch specified by GIT_TAG.

REBASE

Try to rebase the current branch to the one specified by GIT_TAG. If there are local uncommitted changes, they will be stashed first and popped again after rebasing. If rebasing or popping stashed changes fail, abort the rebase and halt with an error. When GIT_REMOTE_UPDATE_STRATEGY is not present, this is the default strategy unless the default has been overridden with CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY (see below). Note that if the branch specified in GIT_TAG is different to the upstream branch currently being tracked, it is not safe to perform a rebase. In that situation, REBASE will silently be treated as CHECKOUT instead.

REBASE_CHECKOUT

Same as REBASE except if the rebase fails, an annotated tag will be created at the original HEAD position from before the rebase and then checkout GIT_TAG just like the CHECKOUT strategy. The message stored on the annotated tag will give information about what was attempted and the tag name will include a timestamp so that each failed run will add a new tag. This strategy ensures no changes will be lost, but updates should always succeed if GIT_TAG refers to a valid ref unless there are uncommitted changes that cannot be popped successfully.

The variable CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY can be set to override the default strategy. This variable should not be set by a project, it is intended for the user to set. It is primarily intended for use in continuous integration scripts to ensure that when history is rewritten on a remote branch, the build doesn't end up with unintended changes or failed builds resulting from conflicts during rebase operations.

### Subversion
SVN_REPOSITORY <url>

URL of the Subversion repository.

SVN_REVISION -r<rev>

Revision to checkout from the Subversion repository.

SVN_USERNAME <username>

Username for the Subversion checkout and update.

SVN_PASSWORD <password>

Password for the Subversion checkout and update.

SVN_TRUST_CERT <bool>

Specifies whether to trust the Subversion server site certificate. If enabled, the --trust-server-cert option is passed to the svn checkout and update commands.

### Mercurial
HG_REPOSITORY <url>

URL of the mercurial repository.

HG_TAG <tag>

Mercurial branch name, tag or commit id.

### CVS
CVS_REPOSITORY <cvsroot>

CVSROOT of the CVS repository.

CVS_MODULE <mod>

Module to checkout from the CVS repository.

CVS_TAG <tag>

Tag to checkout from the CVS repository.

### Update Step Options
Whenever CMake is re-run, by default the external project's sources will be updated if the download method supports updates (e.g. a git repository would be checked if the GIT_TAG does not refer to a specific commit).

UPDATE_COMMAND <cmd>...

Overrides the download method's update step with a custom command. The command may use generator expressions <#manual:cmake-generator-expressions(7)>.

UPDATE_DISCONNECTED <bool>

Added in version 3.2.

When enabled, this option causes the update step to be skipped (but see below for changed behavior where this is not the case). It does not prevent the download step. The update step can still be added as a step target (see ExternalProject_Add_StepTargets()) and called manually. This is useful if you want to allow developers to build the project when disconnected from the network (the network may still be needed for the download step though).

Changed in version 3.27: When UPDATE_DISCONNECTED is true, the update step will be executed if any details about the update or download step are changed. Furthermore, if using the git download/update method, the update logic will be modified to skip attempts to contact the remote. If the GIT_TAG mentions a ref that is not known locally, the update step will halt with a fatal error.

When this option is present, it is generally advisable to make the value a cache variable under the developer's control rather than hard-coding it. If this option is not present, the default value is taken from the EP_UPDATE_DISCONNECTED directory property. If that is also not defined, updates are performed as normal. The EP_UPDATE_DISCONNECTED directory property is intended as a convenience for controlling the UPDATE_DISCONNECTED behavior for an entire section of a project's directory hierarchy and may be a more convenient method of giving developers control over whether or not to perform updates (assuming the project also provides a cache variable or some other convenient method for setting the directory property).

This may cause a step target to be created automatically for the download step. See policy CMP0114 <#policy:CMP0114>.

### Patch Step Options
PATCH_COMMAND <cmd>...

Specifies a custom command to patch the sources after an update. By default, no patch command is defined. Note that it can be quite difficult to define an appropriate patch command that performs robustly, especially for download methods such as git where changing the GIT_TAG will not discard changes from a previous patch, but the patch command will be called again after updating to the new tag.

### Configure Step Options
The configure step is run after the download and update steps. By default, the external project is assumed to be a CMake project, but this can be overridden if required.

CONFIGURE_COMMAND <cmd>...

The default configure command runs CMake with a few options based on the main project. The options added are typically only those needed to use the same generator as the main project, but the CMAKE_GENERATOR option can be given to override this. The project is responsible for adding any toolchain details, flags or other settings it wants to reuse from the main project or otherwise specify (see CMAKE_ARGS, CMAKE_CACHE_ARGS and CMAKE_CACHE_DEFAULT_ARGS below). For non-CMake external projects, the CONFIGURE_COMMAND option must be used to override the default configure command (generator expressions <#manual:cmake-generator-expressions(7)> are supported). For projects that require no configure step, specify this option with an empty string as the command to execute.

CMAKE_COMMAND /.../cmake

Specify an alternative cmake executable for the configure step (use an absolute path). This is generally not recommended, since it is usually desirable to use the same CMake version throughout the whole build. This option is ignored if a custom configure command has been specified with CONFIGURE_COMMAND.

CMAKE_GENERATOR <gen>

Override the CMake generator used for the configure step. Without this option, the same generator as the main build will be used. This option is ignored if a custom configure command has been specified with the CONFIGURE_COMMAND option.

CMAKE_GENERATOR_PLATFORM <platform>

Added in version 3.1.

Pass a generator-specific platform name to the CMake command (see CMAKE_GENERATOR_PLATFORM <#variable:CMAKE_GENERATOR_PLATFORM>). It is an error to provide this option without the CMAKE_GENERATOR option.

CMAKE_GENERATOR_TOOLSET <toolset>

Pass a generator-specific toolset name to the CMake command (see CMAKE_GENERATOR_TOOLSET <#variable:CMAKE_GENERATOR_TOOLSET>). It is an error to provide this option without the CMAKE_GENERATOR option.

CMAKE_GENERATOR_INSTANCE <instance>

Added in version 3.11.

Pass a generator-specific instance selection to the CMake command (see CMAKE_GENERATOR_INSTANCE <#variable:CMAKE_GENERATOR_INSTANCE>). It is an error to provide this option without the CMAKE_GENERATOR option.

CMAKE_ARGS <arg>...

The specified arguments are passed to the cmake command line. They can be any argument the cmake command understands, not just cache values defined by -D... arguments (see also CMake Options <#manual:cmake(1)>). Added in version 3.3: Arguments may use generator expressions <#manual:cmake-generator-expressions(7)>.

CMAKE_CACHE_ARGS <arg>...

This is an alternate way of specifying cache variables where command line length issues may become a problem. The arguments are expected to be in the form -Dvar:STRING=value, which are then transformed into CMake set() <#command:set> commands with the FORCE option used. These set() commands are written to a pre-load script which is then applied using the cmake -C <#manual:cmake(1)> command line option. Added in version 3.3: Arguments may use generator expressions <#manual:cmake-generator-expressions(7)>.

CMAKE_CACHE_DEFAULT_ARGS <arg>...

Added in version 3.2.

This is the same as the CMAKE_CACHE_ARGS option except the set() commands do not include the FORCE keyword. This means the values act as initial defaults only and will not override any variables already set from a previous run. Use this option with care, as it can lead to different behavior depending on whether the build starts from a fresh build directory or reuses previous build contents.

Added in version 3.15: If the CMake generator is the Green Hills MULTI and not overridden, the original project's settings for the GHS toolset and target system customization cache variables are propagated into the external project.

SOURCE_SUBDIR <dir>

Added in version 3.7.

When no CONFIGURE_COMMAND option is specified, the configure step assumes the external project has a CMakeLists.txt file at the top of its source tree (i.e. in SOURCE_DIR). The SOURCE_SUBDIR option can be used to point to an alternative directory within the source tree to use as the top of the CMake source tree instead. This must be a relative path and it will be interpreted as being relative to SOURCE_DIR.

Added in version 3.14: When BUILD_IN_SOURCE option is enabled, the BUILD_COMMAND is used to point to an alternative directory within the source tree.

CONFIGURE_HANDLED_BY_BUILD <bool>

Added in version 3.20.

Enabling this option relaxes the dependencies of the configure step on other external projects to order-only. This means the configure step will be executed after its external project dependencies are built but it will not be marked dirty when one of its external project dependencies is rebuilt. This option can be enabled when the build step is smart enough to figure out if the configure step needs to be rerun. CMake and Meson are examples of build systems whose build step is smart enough to know if the configure step needs to be rerun.

CONFIGURE_ENVIRONMENT_MODIFICATION <modification>...

Added in version 4.2.

Specify environment variables that should be modified for the configure step.

Set a semicolon-separated list <#cmake-language-lists> of environment variables and values of the form MYVAR=OP:VALUE, where MYVAR is the case-sensitive name of an environment variable to be modified. Entries are considered in the order specified in the property's value. The OP may be one of:

- reset: Reset to the unmodified value, ignoring all modifications to MYVAR prior to this entry. Note that this will reset the variable to the value set by ENVIRONMENT <#prop_test:ENVIRONMENT>, if it was set, and otherwise to its state from the rest of the CTest execution.

- set: Replaces the current value of MYVAR with VALUE.

- unset: Unsets the current value of MYVAR.

- string_append: Appends singular VALUE to the current value of MYVAR.

- string_prepend: Prepends singular VALUE to the current value of MYVAR.

- path_list_append: Appends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- path_list_prepend: Prepends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- cmake_list_append: Appends singular VALUE to the current value of MYVAR using ; as the separator.

- cmake_list_prepend: Prepends singular VALUE to the current value of MYVAR using ; as the separator.

```
ExternalProject_Add(example

  ... # Download options, etc...

  CONFIGURE_ENVIRONMENT_MODIFICATION

    SDKROOT=set:macosx

    PKG_CONFIG_PATH=set:$ENV{PKG_CONFIG_PATH}
)
```

This snippet defines two environment variables when configuring the example project. The SDKROOT environment variable is set to macosx, while the value of PKG_CONFIG_PATH is forwarded to the external project.

Environment modifications work with LIST_SEPARATOR to replace the separator with a ; in the environment variable.

```
ExternalProject_Add(example

  ... # Download options, etc...

  LIST_SEPARATOR ,

  CONFIGURE_ENVIRONMENT_MODIFICATION

    LIST_VAR=set:a,b,c
)
```

This snippet and the environment variable LIST_VAR is passed to the configure command invocation with the value a;b;c.

### Build Step Options
If the configure step assumed the external project uses CMake as its build system, the build step will also. Otherwise, the build step will assume a Makefile-based build and simply run make with no arguments as the default build step. This can be overridden with custom build commands if required.

If both the main project and the external project use make as their build tool, the build step of the external project is invoked as a recursive make using $(MAKE). This will communicate some build tool settings from the main project to the external project. If either the main project or external project is not using make, no build tool settings will be passed to the external project other than those established by the configure step (i.e. running ninja -v in the main project will not pass -v to the external project's build step, even if it also uses ninja as its build tool).

BUILD_COMMAND <cmd>...

Overrides the default build command (generator expressions <#manual:cmake-generator-expressions(7)> are supported). If this option is not given, the default build command will be chosen to integrate with the main build in the most appropriate way (e.g. using recursive make for Makefile generators or cmake --build <#cmdoption-cmake-build> if the project uses a CMake build). This option can be specified with an empty string as the command to make the build step do nothing.

BUILD_IN_SOURCE <bool>

When this option is enabled, the build will be done directly within the external project's source tree. This should generally be avoided, the use of a separate build directory is usually preferred, but it can be useful when the external project assumes an in-source build. The BINARY_DIR option should not be specified if building in-source.

BUILD_ALWAYS <bool>

Enabling this option forces the build step to always be run. This can be the easiest way to robustly ensure that the external project's own build dependencies are evaluated rather than relying on the default success timestamp-based method. This option is not normally needed unless developers are expected to modify something the external project's build depends on in a way that is not detectable via the step target dependencies (e.g. SOURCE_DIR is used without a download method and developers might modify the sources in SOURCE_DIR).

BUILD_BYPRODUCTS <file>...

Added in version 3.2.

Specifies files that will be generated by the build command but which might or might not have their modification time updated by subsequent builds. This may also be required to explicitly declare dependencies when using the Ninja <#generator:Ninja> generator. These ultimately get passed through as BYPRODUCTS to the build step's own underlying call to add_custom_command() <#command:add_custom_command>, which has additional documentation.

BUILD_JOB_SERVER_AWARE <bool>

Added in version 3.28.

Specifies that the build step is aware of the GNU Make job server. See the add_custom_command() <#command:add_custom_command> documentation of its JOB_SERVER_AWARE option for details. This option is relevant only when an explicit BUILD_COMMAND is specified.

BUILD_ENVIRONMENT_MODIFICATION <modification>...

Added in version 4.2.

Specify environment variables that should be modified for the build step.

Set a semicolon-separated list <#cmake-language-lists> of environment variables and values of the form MYVAR=OP:VALUE, where MYVAR is the case-sensitive name of an environment variable to be modified. Entries are considered in the order specified in the property's value. The OP may be one of:

- reset: Reset to the unmodified value, ignoring all modifications to MYVAR prior to this entry. Note that this will reset the variable to the value set by ENVIRONMENT <#prop_test:ENVIRONMENT>, if it was set, and otherwise to its state from the rest of the CTest execution.

- set: Replaces the current value of MYVAR with VALUE.

- unset: Unsets the current value of MYVAR.

- string_append: Appends singular VALUE to the current value of MYVAR.

- string_prepend: Prepends singular VALUE to the current value of MYVAR.

- path_list_append: Appends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- path_list_prepend: Prepends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- cmake_list_append: Appends singular VALUE to the current value of MYVAR using ; as the separator.

- cmake_list_prepend: Prepends singular VALUE to the current value of MYVAR using ; as the separator.

### Install Step Options
If the configure step assumed the external project uses CMake as its build system, the install step will also. Otherwise, the install step will assume a Makefile-based build and simply run make install as the default build step. This can be overridden with custom install commands if required.

INSTALL_COMMAND <cmd>...

The external project's own install step is invoked as part of the main project's build. It is done after the external project's build step and may be before or after the external project's test step (see the TEST_BEFORE_INSTALL option below). The external project's install rules are not part of the main project's install rules, so if anything from the external project should be installed as part of the main build, these need to be specified in the main build as additional install() <#command:install> commands. The default install step builds the install target of the external project, but this can be overridden with a custom command using this option (generator expressions <#manual:cmake-generator-expressions(7)> are supported). Passing an empty string as the <cmd> makes the install step do nothing.

INSTALL_BYPRODUCTS <file>...

Added in version 3.26.

Specifies files that will be generated by the install command but which might or might not have their modification time updated by subsequent installs. This may also be required to explicitly declare dependencies when using the Ninja <#generator:Ninja> generator. These ultimately get passed through as BYPRODUCTS to the install step's own underlying call to add_custom_command() <#command:add_custom_command>, which has additional documentation.

INSTALL_JOB_SERVER_AWARE <bool>

Added in version 4.0.

Specifies that the install step is aware of the GNU Make job server. See the add_custom_command() <#command:add_custom_command> documentation of its JOB_SERVER_AWARE option for details. This option is relevant only when an explicit INSTALL_COMMAND is specified.

Note:

If the CMAKE_INSTALL_MODE <#envvar:CMAKE_INSTALL_MODE> environment variable is set when the main project is built, it will only have an effect if the following conditions are met:

- The main project's configure step assumed the external project uses CMake as its build system.

- The external project's install command actually runs. Note that due to the way ExternalProject may use timestamps internally, if nothing the install step depends on needs to be re-executed, the install command might also not need to run.

Note also that ExternalProject does not check whether the CMAKE_INSTALL_MODE <#envvar:CMAKE_INSTALL_MODE> environment variable changes from one run to another.

INSTALL_ENVIRONMENT_MODIFICATION <modification>...

Added in version 4.2.

Specify environment variables that should be modified for the install step.

Set a semicolon-separated list <#cmake-language-lists> of environment variables and values of the form MYVAR=OP:VALUE, where MYVAR is the case-sensitive name of an environment variable to be modified. Entries are considered in the order specified in the property's value. The OP may be one of:

- reset: Reset to the unmodified value, ignoring all modifications to MYVAR prior to this entry. Note that this will reset the variable to the value set by ENVIRONMENT <#prop_test:ENVIRONMENT>, if it was set, and otherwise to its state from the rest of the CTest execution.

- set: Replaces the current value of MYVAR with VALUE.

- unset: Unsets the current value of MYVAR.

- string_append: Appends singular VALUE to the current value of MYVAR.

- string_prepend: Prepends singular VALUE to the current value of MYVAR.

- path_list_append: Appends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- path_list_prepend: Prepends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- cmake_list_append: Appends singular VALUE to the current value of MYVAR using ; as the separator.

- cmake_list_prepend: Prepends singular VALUE to the current value of MYVAR using ; as the separator.

### Test Step Options
The test step is only defined if at least one of the following TEST_... options are provided.

TEST_COMMAND <cmd>...

Overrides the default test command (generator expressions <#manual:cmake-generator-expressions(7)> are supported). If this option is not given, the default behavior of the test step is to build the external project's own test target. This option can be specified with <cmd> as an empty string, which allows the test step to still be defined, but it will do nothing. Do not specify any of the other TEST_... options if providing an empty string as the test command, but prefer to omit all TEST_... options altogether if the test step target is not needed.

TEST_BEFORE_INSTALL <bool>

When this option is enabled, the test step will be executed before the install step. The default behavior is for the test step to run after the install step.

TEST_AFTER_INSTALL <bool>

This option is mainly useful as a way to indicate that the test step is desired but all default behavior is sufficient. Specifying this option with a boolean true value ensures the test step is defined and that it comes after the install step. If both TEST_BEFORE_INSTALL and TEST_AFTER_INSTALL are enabled, the latter is silently ignored.

TEST_EXCLUDE_FROM_MAIN <bool>

Added in version 3.2.

If enabled, the main build's default ALL target will not depend on the test step. This can be a useful way of ensuring the test step is defined but only gets invoked when manually requested. This may cause a step target to be created automatically for either the install or build step. See policy CMP0114 <#policy:CMP0114>.

TEST_ENVIRONMENT_MODIFICATION <modification>...

Added in version 4.2.

Specify environment variables that should be modified for the test step.

Set a semicolon-separated list <#cmake-language-lists> of environment variables and values of the form MYVAR=OP:VALUE, where MYVAR is the case-sensitive name of an environment variable to be modified. Entries are considered in the order specified in the property's value. The OP may be one of:

- reset: Reset to the unmodified value, ignoring all modifications to MYVAR prior to this entry. Note that this will reset the variable to the value set by ENVIRONMENT <#prop_test:ENVIRONMENT>, if it was set, and otherwise to its state from the rest of the CTest execution.

- set: Replaces the current value of MYVAR with VALUE.

- unset: Unsets the current value of MYVAR.

- string_append: Appends singular VALUE to the current value of MYVAR.

- string_prepend: Prepends singular VALUE to the current value of MYVAR.

- path_list_append: Appends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- path_list_prepend: Prepends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- cmake_list_append: Appends singular VALUE to the current value of MYVAR using ; as the separator.

- cmake_list_prepend: Prepends singular VALUE to the current value of MYVAR using ; as the separator.

### Output Logging Options
Each of the following LOG_... options can be used to wrap the relevant step in a script to capture its output to files. The log files will be created in LOG_DIR if supplied or otherwise the STAMP_DIR directory with step-specific file names.

LOG_DOWNLOAD <bool>

When enabled, the output of the download step is logged to files.

LOG_UPDATE <bool>

When enabled, the output of the update step is logged to files.

LOG_PATCH <bool>

Added in version 3.14.

When enabled, the output of the patch step is logged to files.

LOG_CONFIGURE <bool>

When enabled, the output of the configure step is logged to files.

LOG_BUILD <bool>

When enabled, the output of the build step is logged to files.

LOG_INSTALL <bool>

When enabled, the output of the install step is logged to files.

LOG_TEST <bool>

When enabled, the output of the test step is logged to files.

LOG_MERGED_STDOUTERR <bool>

Added in version 3.14.

When enabled, stdout and stderr will be merged for any step whose output is being logged to files.

LOG_OUTPUT_ON_FAILURE <bool>

Added in version 3.14.

This option only has an effect if at least one of the other LOG_<step> options is enabled. If an error occurs for a step which has logging to file enabled, that step's output will be printed to the console if LOG_OUTPUT_ON_FAILURE is set to true. For cases where a large amount of output is recorded, just the end of that output may be printed to the console.

### Terminal Access Options
Added in version 3.4.

Steps can be given direct access to the terminal in some cases. Giving a step access to the terminal may allow it to receive terminal input if required, such as for authentication details not provided by other options. With the Ninja <#generator:Ninja> generator, these options place the steps in the console job pool <#prop_gbl:JOB_POOLS>. Each step can be given access to the terminal individually via the following options:

USES_TERMINAL_DOWNLOAD <bool>

Give the download step access to the terminal.

USES_TERMINAL_UPDATE <bool>

Give the update step access to the terminal.

USES_TERMINAL_PATCH <bool>

Added in version 3.23.

Give the patch step access to the terminal.

USES_TERMINAL_CONFIGURE <bool>

Give the configure step access to the terminal.

USES_TERMINAL_BUILD <bool>

Give the build step access to the terminal.

USES_TERMINAL_INSTALL <bool>

Give the install step access to the terminal.

USES_TERMINAL_TEST <bool>

Give the test step access to the terminal.

### Target Options
DEPENDS <targets>...

Specify other targets on which the external project depends. The other targets will be brought up to date before any of the external project's steps are executed. Because the external project uses additional custom targets internally for each step, the DEPENDS option is the most convenient way to ensure all of those steps depend on the other targets. Simply doing add_dependencies(<name> <targets>) <#command:add_dependencies> will not make any of the steps dependent on <targets>.

EXCLUDE_FROM_ALL <bool>

When enabled, this option excludes the external project from the default ALL target of the main build.

STEP_TARGETS <step-target>...

Generate custom targets for the specified steps. This is required if the steps need to be triggered manually or if they need to be used as dependencies of other targets. If this option is not specified, the default value is taken from the EP_STEP_TARGETS directory property. See ExternalProject_Add_StepTargets() below for further discussion of the effects of this option.

INDEPENDENT_STEP_TARGETS <step-target>...

Deprecated since version 3.19: This is allowed only if policy CMP0114 <#policy:CMP0114> is not set to NEW.

Generates custom targets for the specified steps and prevent these targets from having the usual dependencies applied to them. If this option is not specified, the default value is taken from the EP_INDEPENDENT_STEP_TARGETS directory property. This option is mostly useful for allowing individual steps to be driven independently, such as for a CDash setup where each step should be initiated and reported individually rather than as one whole build. See ExternalProject_Add_StepTargets() below for further discussion of the effects of this option.

### Miscellaneous Options
LIST_SEPARATOR <sep>

For any of the various ..._COMMAND options, CMAKE_ARGS, and ..._ENVIRONMENT_MODIFICATION` operations, ExternalProject will replace <sep> with ; in the specified command lines. This can be used to ensure a command has a literal ; in it where direct usage would otherwise be interpreted as argument separators to CMake APIs instead. Note that the separator should be chosen to avoid being confused for non-list-separator usages of the sequence. For example, using LIST_SEPARATOR allows for passing list values to CMake cache variables on the command line:

```
ExternalProject_Add(example

  ... # Download options, etc.

  LIST_SEPARATOR ","

  CMAKE_ARGS "-DCMAKE_PREFIX_PATH:STRING=${first_prefix},${second_prefix}"
)
```

COMMAND <cmd>...

Any of the other ..._COMMAND options can have additional commands appended to them by following them with as many COMMAND ... options as needed (generator expressions <#manual:cmake-generator-expressions(7)> are supported). For example:

```
ExternalProject_Add(example

  ... # Download options, etc.

  BUILD_COMMAND ${CMAKE_COMMAND} -E echo "Starting $<CONFIG> build"

  COMMAND       ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG>

  COMMAND       ${CMAKE_COMMAND} -E echo "$<CONFIG> build complete"
)
```

It should also be noted that each build step is created via a call to ExternalProject_Add_Step(). See that command's documentation for the automatic substitutions that are supported for some options.

### Obtaining Project Properties
ExternalProject_Get_Property

The ExternalProject_Get_Property() function retrieves external project target properties:

```
ExternalProject_Get_Property(<name> <prop1> [<prop2>...])
```

The function stores property values in variables of the same name. Property names correspond to the keyword argument names of ExternalProject_Add(). For example, the source directory might be retrieved like so:

```
ExternalProject_Get_property(myExtProj SOURCE_DIR)
message("Source dir of myExtProj = ${SOURCE_DIR}")
```

### Explicit Step Management
The ExternalProject_Add() function on its own is often sufficient for incorporating an external project into the main build. Certain scenarios require additional work to implement desired behavior, such as adding in a custom step or making steps available as manually triggerable targets. The ExternalProject_Add_Step(), ExternalProject_Add_StepTargets() and ExternalProject_Add_StepDependencies functions provide the lower level control needed to implement such step-level capabilities.

ExternalProject_Add_Step

The ExternalProject_Add_Step() function specifies an additional custom step for an external project defined by an earlier call to ExternalProject_Add():

```
ExternalProject_Add_Step(<name> <step> [<option>...])
```

<name> is the same as the name passed to the original call to ExternalProject_Add(). The specified <step> must not be one of the pre-defined steps (mkdir, download, update, patch, configure, build, install or test). The supported options are:

COMMAND <cmd>...

The command line to be executed by this custom step (generator expressions <#manual:cmake-generator-expressions(7)> are supported). This option can be repeated multiple times to specify multiple commands to be executed in order.

COMMENT "<text>..."

Text to be printed when the custom step executes.

DEPENDEES <step>...

Other steps (custom or pre-defined) on which this step depends.

DEPENDERS <step>...

Other steps (custom or pre-defined) that depend on this new custom step.

DEPENDS <file>...

Files on which this custom step depends.

ENVIRONMENT_MODIFICATION <modification>...

Added in version 4.2.

Specify environment variables that should be modified while running the commands in the external project step.

Set a semicolon-separated list <#cmake-language-lists> of environment variables and values of the form MYVAR=OP:VALUE, where MYVAR is the case-sensitive name of an environment variable to be modified. Entries are considered in the order specified in the property's value. The OP may be one of:

- reset: Reset to the unmodified value, ignoring all modifications to MYVAR prior to this entry. Note that this will reset the variable to the value set by ENVIRONMENT <#prop_test:ENVIRONMENT>, if it was set, and otherwise to its state from the rest of the CTest execution.

- set: Replaces the current value of MYVAR with VALUE.

- unset: Unsets the current value of MYVAR.

- string_append: Appends singular VALUE to the current value of MYVAR.

- string_prepend: Prepends singular VALUE to the current value of MYVAR.

- path_list_append: Appends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- path_list_prepend: Prepends singular VALUE to the current value of MYVAR using the host platform's path list separator (; on Windows and : elsewhere).

- cmake_list_append: Appends singular VALUE to the current value of MYVAR using ; as the separator.

- cmake_list_prepend: Prepends singular VALUE to the current value of MYVAR using ; as the separator.

INDEPENDENT <bool>

Added in version 3.19.

Specifies whether this step is independent of the external dependencies specified by the ExternalProject_Add()'s DEPENDS option. The default is FALSE. Steps marked as independent may depend only on other steps marked independent. See policy CMP0114 <#policy:CMP0114>.

Note that this use of the term "independent" refers only to independence from external targets specified by the DEPENDS option and is orthogonal to a step's dependencies on other steps.

If a step target is created for an independent step by the ExternalProject_Add() STEP_TARGETS option or by the ExternalProject_Add_StepTargets() function, it will not depend on the external targets, but may depend on targets for other steps.

BYPRODUCTS <file>...

Added in version 3.2.

Files that will be generated by this custom step but which might or might not have their modification time updated by subsequent builds. This may also be required to explicitly declare dependencies when using the Ninja <#generator:Ninja> generator. This list of files will ultimately be passed through as the BYPRODUCTS option to the add_custom_command() <#command:add_custom_command> used to implement the custom step internally, which has additional documentation.

ALWAYS <bool>

When enabled, this option specifies that the custom step should always be run (i.e. that it is always considered out of date).

JOB_SERVER_AWARE <bool>

Added in version 3.28.

Specifies that the custom step is aware of the GNU Make job server. See the add_custom_command() <#command:add_custom_command> documentation of its JOB_SERVER_AWARE option for details.

EXCLUDE_FROM_MAIN <bool>

When enabled, this option specifies that the external project's main target does not depend on the custom step. This may cause step targets to be created automatically for the steps on which this step depends. See policy CMP0114 <#policy:CMP0114>.

WORKING_DIRECTORY <dir>

Specifies the working directory to set before running the custom step's command. If this option is not specified, the directory will be the value of the CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> at the point where ExternalProject_Add_Step() was called.

LOG <bool>

If set, this causes the output from the custom step to be captured to files in the external project's LOG_DIR if supplied or STAMP_DIR.

USES_TERMINAL <bool>

If enabled, this gives the custom step direct access to the terminal if possible.

The command line, comment, working directory and byproducts of every standard and custom step are processed to replace the tokens <SOURCE_DIR>, <SOURCE_SUBDIR>, <BINARY_DIR>, <INSTALL_DIR> <TMP_DIR>, <DOWNLOAD_DIR> and <DOWNLOADED_FILE> with their corresponding property values defined in the original call to ExternalProject_Add().

Added in version 3.3: Token replacement is extended to byproducts.

Added in version 3.11: The <DOWNLOAD_DIR> substitution token.

ExternalProject_Add_StepTargets

The ExternalProject_Add_StepTargets() function generates targets for the steps listed. The name of each created target will be of the form <name>-<step>:

```
ExternalProject_Add_StepTargets(<name> <step1> [<step2>...])
```

Creating a target for a step allows it to be used as a dependency of another target or to be triggered manually. Having targets for specific steps also allows them to be driven independently of each other by specifying targets on build command lines. For example, you may be submitting to a sub-project based dashboard where you want to drive the configure portion of the build, then submit to the dashboard, followed by the build portion, followed by tests. If you invoke a custom target that depends on a step halfway through the step dependency chain, then all the previous steps will also run to ensure everything is up to date.

Internally, ExternalProject_Add() calls ExternalProject_Add_Step() to create each step. If any STEP_TARGETS were specified, then ExternalProject_Add_StepTargets() will also be called after ExternalProject_Add_Step(). Even if a step is not mentioned in the STEP_TARGETS option, ExternalProject_Add_StepTargets() can still be called later to manually define a target for the step.

The STEP_TARGETS option for ExternalProject_Add() is generally the easiest way to ensure targets are created for specific steps of interest. For custom steps, ExternalProject_Add_StepTargets() must be called explicitly if a target should also be created for that custom step. An alternative to these two options is to populate the EP_STEP_TARGETS directory property. It acts as a default for the step target options and can save having to repeatedly specify the same set of step targets when multiple external projects are being defined.

Added in version 3.19: If CMP0114 <#policy:CMP0114> is set to NEW, step targets are fully responsible for holding the custom commands implementing their steps. The primary target created by ExternalProject_Add depends on the step targets, and the step targets depend on each other. The target-level dependencies match the file-level dependencies used by the custom commands for each step. The targets for steps created with ExternalProject_Add_Step()'s INDEPENDENT option do not depend on the external targets specified by ExternalProject_Add()'s DEPENDS option. The predefined steps mkdir, download, update, and patch are independent.

If CMP0114 <#policy:CMP0114> is not NEW, the following deprecated behavior is available:

- A deprecated NO_DEPENDS option may be specified immediately after the <name> and before the first step. If the NO_DEPENDS option is specified, the step target will not depend on the dependencies of the external project (i.e. on any dependencies of the <name> custom target created by ExternalProject_Add()). This is usually safe for the download, update and patch steps, since they do not typically require that the dependencies are updated and built. Using NO_DEPENDS for any of the other pre-defined steps, however, may break parallel builds. Only use NO_DEPENDS where it is certain that the named steps genuinely do not have dependencies. For custom steps, consider whether or not the custom commands require the dependencies to be configured, built and installed.

- The INDEPENDENT_STEP_TARGETS option for ExternalProject_Add(), or the EP_INDEPENDENT_STEP_TARGETS directory property, tells the function to call ExternalProject_Add_StepTargets() internally using the NO_DEPENDS option for the specified steps.

ExternalProject_Add_StepDependencies

Added in version 3.2.

The ExternalProject_Add_StepDependencies() function can be used to add dependencies to a step. The dependencies added must be targets CMake already knows about (these can be ordinary executable or library targets, custom targets or even step targets of another external project):

```
ExternalProject_Add_StepDependencies(<name> <step> <target1> [<target2>...])
```

This function takes care to set both target and file level dependencies and will ensure that parallel builds will not break. It should be used instead of add_dependencies() <#command:add_dependencies> whenever adding a dependency for some of the step targets generated by the ExternalProject module.

### Examples
The following example shows how to download and build a hypothetical project called FooBar from github:

```
include(ExternalProject)
ExternalProject_Add(foobar

  GIT_REPOSITORY    git@github.com:FooCo/FooBar.git

  GIT_TAG           origin/release/1.2.3
)
```

For the sake of the example, also define a second hypothetical external project called SecretSauce, which is downloaded from a web server. Two URLs are given to take advantage of a faster internal network if available, with a fallback to a slower external server. The project is a typical Makefile project with no configure step, so some of the default commands are overridden. The build is only required to build the sauce target:

```
find_program(MAKE_EXE NAMES gmake nmake make)
ExternalProject_Add(secretsauce

  URL               http://intranet.somecompany.com/artifacts/sauce-2.7.tgz

                    https://www.somecompany.com/downloads/sauce-2.7.zip

  URL_HASH          MD5=d41d8cd98f00b204e9800998ecf8427e

  CONFIGURE_COMMAND ""

  BUILD_COMMAND     ${MAKE_EXE} sauce
)
```

Suppose the build step of secretsauce requires that foobar must already be built. This could be enforced like so:

```
ExternalProject_Add_StepDependencies(secretsauce build foobar)
```

Another alternative would be to create a custom target for foobar's build step and make secretsauce depend on that rather than the whole foobar project. This would mean foobar only needs to be built, it doesn't need to run its install or test steps before secretsauce can be built. The dependency can also be defined along with the secretsauce project:

```
ExternalProject_Add_StepTargets(foobar build)
ExternalProject_Add(secretsauce

  URL               http://intranet.somecompany.com/artifacts/sauce-2.7.tgz

                    https://www.somecompany.com/downloads/sauce-2.7.zip

  URL_HASH          MD5=d41d8cd98f00b204e9800998ecf8427e

  CONFIGURE_COMMAND ""

  BUILD_COMMAND     ${MAKE_EXE} sauce

  DEPENDS           foobar-build
)
```

Instead of calling ExternalProject_Add_StepTargets(), the target could be defined along with the foobar project itself:

```
ExternalProject_Add(foobar

  GIT_REPOSITORY git@github.com:FooCo/FooBar.git

  GIT_TAG        origin/release/1.2.3

  STEP_TARGETS   build
)
```

If many external projects should have the same set of step targets, setting a directory property may be more convenient. The build step target could be created automatically by setting the EP_STEP_TARGETS directory property before creating the external projects with ExternalProject_Add():

```
set_property(DIRECTORY PROPERTY EP_STEP_TARGETS build)
```

Lastly, suppose that secretsauce provides a script called makedoc which can be used to generate its own documentation. Further suppose that the script expects the output directory to be provided as the only parameter and that it should be run from the secretsauce source directory. A custom step and a custom target to trigger the script can be defined like so:

```
ExternalProject_Add_Step(secretsauce docs

  COMMAND           <SOURCE_DIR>/makedoc <BINARY_DIR>

  WORKING_DIRECTORY <SOURCE_DIR>

  COMMENT           "Building secretsauce docs"

  ALWAYS            TRUE

  EXCLUDE_FROM_MAIN TRUE
)
ExternalProject_Add_StepTargets(secretsauce docs)
```

The custom step could then be triggered from the main build like so:

```
cmake --build . --target secretsauce-docs
```

### FeatureSummary
This module provides commands for generating a summary of enabled/disabled features.

Load this module in CMake with:

```
include(FeatureSummary)
```

Commands provided by this module can be used to generate a summary of enabled and disabled packages and/or features for a build tree such as:

```
-- The following features have been enabled:

 * Example, usage example
-- The following OPTIONAL packages have been found:

 * LibXml2 (required version >= 2.4), XML library, <http://xmlsoft.org>

   Enables HTML-import in MyWordProcessor

   Enables odt-export in MyWordProcessor

 * PNG, image library, <http://www.libpng.org/pub/png/>

   Enables saving screenshots
-- The following OPTIONAL packages have not been found:

 * Lua, the Lua scripting language, <https://www.lua.org>

   Enables macros in MyWordProcessor

 * OpenGL, Open Graphics Library
```

### Global Properties
The following global properties are used by this module:

FeatureSummary_PKG_TYPES

Added in version 3.8.

This global property defines a semicolon-separated list <#cmake-language-lists> of package types used by the FeatureSummary module.

The order in this list is important, the first package type in the list has the lowest importance, while the last has the highest importance. The type of a package can only be changed to a type with higher importance.

The default package types are RUNTIME, OPTIONAL, RECOMMENDED and REQUIRED, with their importance ranked as RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED.

FeatureSummary_REQUIRED_PKG_TYPES

Added in version 3.8.

This global property defines a semicolon-separated list <#cmake-language-lists> of package types that are considered required.

If one or more packages in these categories are not found, CMake will abort when the feature_summary() command is called with the FATAL_ON_MISSING_REQUIRED_PACKAGES option enabled.

The default value for this global property is REQUIRED.

FeatureSummary_DEFAULT_PKG_TYPE

Added in version 3.8.

This global property defines the default package type.

When the feature_summary() command is called, and the user has not explicitly set a type of some package, its type will be set to the value of this property.

This value must be one of the types defined in the FeatureSummary_PKG_TYPES global property.

The default value for this global property is OPTIONAL.

FeatureSummary_<TYPE>_DESCRIPTION

Added in version 3.9.

This global property can be defined for each package <TYPE> to a string that will be used in the output titles of the feature_summary() command. For example:

```
The following <FeatureSummary_<TYPE>_DESCRIPTION> have been found:
```

If not set, default string <TYPE> packages is used.

### Commands
This module provides the following commands:

- feature_summary()

- set_package_properties()

- add_feature_info()

### Printing Feature Summary
feature_summary

Prints information about enabled or disabled packages and features of a project:

```
feature_summary(

  WHAT (ALL

    | PACKAGES_FOUND | PACKAGES_NOT_FOUND

    | <TYPE>_PACKAGES_FOUND | <TYPE>_PACKAGES_NOT_FOUND

    | ENABLED_FEATURES | DISABLED_FEATURES)

  [FILENAME <file>]

  [APPEND]

  [VAR <variable-name>]

  [INCLUDE_QUIET_PACKAGES]

  [FATAL_ON_MISSING_REQUIRED_PACKAGES]

  [DESCRIPTION <description> | DEFAULT_DESCRIPTION]

  [QUIET_ON_EMPTY]
)
```

This command can be used to print information about enabled or disabled packages and features of a project. By default, only the names of the features/packages will be printed and their required version when one was specified. Use set_package_properties() to add more useful information, e.g., a homepage URL for the respective package or their purpose in the project.

The arguments are:

WHAT

This is the only mandatory option. It specifies what information will be printed:

ALL

Print everything.

ENABLED_FEATURES

The list of all features which are enabled.

DISABLED_FEATURES

The list of all features which are disabled.

PACKAGES_FOUND

The list of all packages which have been found.

PACKAGES_NOT_FOUND

The list of all packages which have not been found.

For each package type <TYPE> defined by the FeatureSummary_PKG_TYPES global property, the following information can also be used:

<TYPE>_PACKAGES_FOUND

The list of only packages of type <TYPE> which have been found.

<TYPE>_PACKAGES_NOT_FOUND

The list of only packages of type <TYPE> which have not been found.

Changed in version 3.1: The WHAT option is now a multi-value keyword, so that these values can be combined, with the exception of the ALL value, in order to customize the output. For example:

```
feature_summary(WHAT ENABLED_FEATURES DISABLED_FEATURES)
```

FILENAME <file>

If this option is given, the information is printed into this file instead of the terminal. Relative <file> path is interpreted as being relative to the current source directory (i.e. CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

APPEND

If this option is given, the output is appended to the <file> provided by the FILENAME option, otherwise the file is overwritten if it already exists.

VAR <variable-name>

If this option is given, the information is stored into the specified variable <variable-name> instead of the terminal.

INCLUDE_QUIET_PACKAGES

If this option is given, packages which have been searched with find_package(... QUIET) <#command:find_package> will also be listed. By default they are skipped.

FATAL_ON_MISSING_REQUIRED_PACKAGES

If this option is given, CMake will abort with fatal error if a package which is marked as one of the package types listed in the FeatureSummary_REQUIRED_PKG_TYPES global property has not been found.

DESCRIPTION <description>

A description or headline which will be printed above the actual content. Without this option, if only one package type was requested, no title is printed, unless a custom string is explicitly set using this option or DEFAULT_DESCRIPTION option is used that outputs a default title for the requested type.

DEFAULT_DESCRIPTION

Added in version 3.9.

The default description or headline to be printed above the content as opposed to the customizable DESCRIPTION <description>.

QUIET_ON_EMPTY

Added in version 3.8.

If this option is given, when only one package type was requested, and no packages belonging to that category were found, then no output (including the DESCRIPTION) is printed nor added to the FILENAME, or the VAR variable.

### Package Properties
set_package_properties

Sets package properties:

```
set_package_properties(

  <PackageName>

  PROPERTIES

    [URL <url>]

    [DESCRIPTION <description>]

    [TYPE (RUNTIME|OPTIONAL|RECOMMENDED|REQUIRED)]

    [PURPOSE <purpose>]
)
```

Use this command to configure and provide information about the package named <PackageName>, which can then be displayed using the feature_summary() command. This command can be called either directly within the corresponding Find module <#find-modules> or in the project that uses the module after invoking the find_package() <#command:find_package> call. The features for which information can be set are determined automatically after the find_package() <#command:find_package> command.

The arguments are:

<PackageName>

The name of the package. For example, as specified in the find_package(<PackageName>) <#command:find_package> argument.

PROPERTIES

Specifies the properties to set:

URL <url>

This should be the homepage of the package, or something similar. Ideally this is set already directly in the Find module <#find-modules>.

DESCRIPTION <description>

A short description what that package is, at most one sentence. Ideally this is set already directly in the Find module <#find-modules>.

TYPE <type>

What type of dependency has the using project on that package. Default <type> is OPTIONAL. In this case it is a package which can be used by the project when available at buildtime, but the project also works without it.

RECOMMENDED package type is similar to OPTIONAL, i.e. the project will build if the package is not present, but the functionality of the resulting binaries will be severely limited. If a REQUIRED package is not available at buildtime, the project may not even build. This can be combined with the feature_summary(FATAL_ON_MISSING_REQUIRED_PACKAGES) command option.

Last, a RUNTIME package is a package which is actually not used at all during the build, but which is required for actually running the resulting binaries. So if such a package is missing, the project can still be built, but it may not work later on.

If set_package_properties() is called multiple times for the same package with different TYPEs, the TYPE is only changed to higher TYPEs (RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED), lower TYPEs are ignored. The TYPE property is project-specific, so it cannot be set by the Find module <#find-modules>, but must be set in the project.

The accepted types can be changed by setting the FeatureSummary_PKG_TYPES global property.

PURPOSE <purpose>

This describes which features this package enables in the project, i.e. it tells the user what functionality they get in the resulting binaries. If set_package_properties() is called multiple times for a package, all PURPOSE properties are appended to a list of purposes of the package in the project. As the TYPE property, also the PURPOSE property is project-specific, so it cannot be set by the Find module <#find-modules>, but must be set in the project.

### Adding Feature Info
add_feature_info

Adds feature information:

```
add_feature_info(<name> <condition> <description>)
```

Use this command to add information about a feature identified with a given <name>.

The arguments are:

<name>

Identification name for a feature being added.

<condition>

Specifies the conditions that determine whether this feature is enabled or disabled. The <condition> argument can be:

- A single condition (such as a variable name).

- Added in version 3.8: A semicolon-separated list <#cmake-language-lists> of multiple conditions.

- Added in version 4.0: A full Condition Syntax <#condition-syntax> as used in an if(<condition>) clause. See policy CMP0183 <#policy:CMP0183>. This enables using entire condition syntax (such as grouping conditions with parens and similar).

<description>

A text describing the feature. This information can be displayed using feature_summary() for ENABLED_FEATURES and DISABLED_FEATURES respectively.

### Deprecated Commands
The following legacy and deprecated commands are provided for backward compatibility with previous CMake versions:

set_package_info

Deprecated since version 3.8: Use the set_package_properties(), and add_feature_info() commands instead.

Sets up information about the specified package, which can then be displayed via feature_summary():

```
set_package_info(<PackageName> <description> [<url> [<purpose>]])
```

<PackageName>

Name of the package.

<description>

A short description of the package.

<url>

Homepage of the package.

<purpose>

The purpose of the package.

This command can be used either directly in the Find module <#find-modules> or in the project which uses the FeatureSummary module after the find_package() <#command:find_package> call. The features for which information can be set are added automatically by the find_package() command.

set_feature_info

Deprecated since version 3.8.

Sets feature info for a package:

```
set_feature_info(<name> <description> [<url>])
```

Does the same as:

```
set_package_info(<name> <description> [<url>])
```

print_enabled_features

Deprecated since version 3.8.

Prints enabled features:

```
print_enabled_features()
```

Does the same as:

```
feature_summary(WHAT ENABLED_FEATURES DESCRIPTION "Enabled features:")
```

print_disabled_features

Deprecated since version 3.8.

Prints disabled features:

```
print_disabled_features()
```

Does the same as:

```
feature_summary(WHAT DISABLED_FEATURES DESCRIPTION "Disabled features:")
```

### Example: Appending Feature Summary to a File
In the following example, the feature summary output will be appended to a specified file instead of printing:

```
include(FeatureSummary)
feature_summary(WHAT ALL FILENAME ${CMAKE_BINARY_DIR}/all.log APPEND)
```

### Example: Storing Feature Summary in a Variable
In the following example, the feature summary of enabled features is stored in a specified variable enabledFeaturesText, including the QUIET packages:

```
include(FeatureSummary)
feature_summary(

  WHAT ENABLED_FEATURES

  INCLUDE_QUIET_PACKAGES

  DESCRIPTION "Enabled Features:"

  VAR enabledFeaturesText
)
message(STATUS "${enabledFeaturesText}")
```

### Example: Adding a Custom Package Type
In the following example a custom package type is added and printed only the categories that are not empty:

```
include(FeatureSummary)
set_property(GLOBAL APPEND PROPERTY FeatureSummary_PKG_TYPES BUILD)
find_package(FOO)
set_package_properties(FOO PROPERTIES TYPE BUILD)
feature_summary(

  WHAT BUILD_PACKAGES_FOUND

  DESCRIPTION "Build tools found:"

  QUIET_ON_EMPTY
)
feature_summary(

  WHAT BUILD_PACKAGES_NOT_FOUND

  DESCRIPTION "Build tools not found:"

  QUIET_ON_EMPTY
)
```

### Example: Setting Package Info
Example for setting the info for a package:

```
include(FeatureSummary)
find_package(LibXml2)
set_package_properties(

  LibXml2

  PROPERTIES

    DESCRIPTION "XML library"

    URL "http://xmlsoft.org"
)
# or
set_package_properties(

  LibXml2

  PROPERTIES

    TYPE RECOMMENDED

    PURPOSE "Enables HTML-import in MyWordProcessor"
)
# or
set_package_properties(

  LibXml2

  PROPERTIES

    TYPE OPTIONAL

    PURPOSE "Enables odt-export in MyWordProcessor"
)
find_package(DBUS)
set_package_properties(

  DBUS

  PROPERTIES

    TYPE RUNTIME

    PURPOSE "Necessary to disable the screensaver during a presentation"
)
```

### Example: Printing Feature Summary
In the following example, this module is used to output feature summary at the end of the configuration. If any required package is not found, processing stops with an error message at the end of the configuration phase.

```
cmake_minimum_required(VERSION 3.15)
project(Example)
add_library(example example.c)
include(FeatureSummary)
find_package(CURL)
set_package_properties(CURL PROPERTIES TYPE REQUIRED)
target_link_libraries(example PRIVATE CURL::libcurl)
find_package(LibXml2 QUIET)
set_package_properties(LibXml2 PROPERTIES TYPE RECOMMENDED)
if(LibXml2_FOUND)

  target_link_libraries(example PRIVATE LibXml2::LibXml2)
endif()
feature_summary(

  WHAT ALL

  INCLUDE_QUIET_PACKAGES

  DESCRIPTION "Feature summary:"

  FATAL_ON_MISSING_REQUIRED_PACKAGES
)
```

### Examples: Setting Feature Info
Example for setting the info for a feature:

```
include(FeatureSummary)
option(WITH_FOO "Help for foo" ON)
add_feature_info(Foo WITH_FOO "this feature provides very cool stuff")
```

Example for setting feature info based on a list of conditions:

```
include(FeatureSummary)
option(WITH_FOO "Help for foo" ON)
option(WITH_BAR "Help for bar" OFF)
add_feature_info(

  FooBar

  "WITH_FOO;NOT WITH_BAR"

  "this feature is enabled when WITH_FOO is ON and WITH_BAR turned OFF"
)
```

In the next example feature info are set depending on a full condition syntax. Unlike semicolon-separated list of conditions, this enables using entire condition syntax as being the if clause argument:

```
include(FeatureSummary)
option(WITH_FOO "Help for foo" ON)
option(WITH_BAR "Help for bar" ON)
option(WITH_BAZ "Help for baz" OFF)
add_feature_info(

  FooBarBaz

  "WITH_FOO AND (WITH_BAR OR WITH_BAZ)"

  "this feature is enabled when the entire condition is true"
)
```

### FetchContent
Added in version 3.11.

This module provides commands to populate content at configure time or as part of the calling script.

Load this module in CMake with:

```
include(FetchContent)
```

Note:

The Using Dependencies Guide <#guide:Using Dependencies Guide> provides a high-level introduction to this general topic. It provides a broader overview of where the FetchContent module fits into the bigger picture, including its relationship to the find_package() <#command:find_package> command. The guide is recommended pre-reading before moving on to the details below.

### Overview
This module enables populating content at configure time via any method supported by the ExternalProject <#module:ExternalProject> module. Whereas ExternalProject_Add() <#command:externalproject_add> downloads at build time, the FetchContent module makes content available immediately, allowing the configure step to use the content in commands like add_subdirectory() <#command:add_subdirectory>, include() <#command:include> or file() <#command:file> operations.

Content population details should be defined separately from the command that performs the actual population. This separation ensures that all the dependency details are defined before anything might try to use them to populate content. This is particularly important in more complex project hierarchies where dependencies may be shared between multiple projects.

The following shows a typical example of declaring content details for some dependencies and then ensuring they are populated with a separate call:

```
FetchContent_Declare(

  googletest

  GIT_REPOSITORY https://github.com/google/googletest.git

  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
)
FetchContent_Declare(

  myCompanyIcons

  URL      https://intranet.mycompany.com/assets/iconset_1.12.tar.gz

  URL_HASH MD5=5588a7b18261c20068beabfb4f530b87
)
FetchContent_MakeAvailable(googletest myCompanyIcons)
```

The FetchContent_MakeAvailable() command ensures the named dependencies have been populated, either by an earlier call, or by populating them itself. When performing the population, it will also add them to the main build, if possible, so that the main build can use the populated projects' targets, etc. See the command's documentation for how these steps are performed.

When using a hierarchical project arrangement, projects at higher levels in the hierarchy are able to override the declared details of content specified anywhere lower in the project hierarchy. The first details to be declared for a given dependency take precedence, regardless of where in the project hierarchy that occurs. Similarly, the first call that tries to populate a dependency "wins", with subsequent populations reusing the result of the first instead of repeating the population again. See the Examples which demonstrate this scenario.

The FetchContent module also supports defining and populating content in a single call, with no check for whether the content has been populated elsewhere already. This should not be done in projects, but may be appropriate for populating content in CMake script mode <#script-processing-mode>. See FetchContent_Populate() for details.

### Commands
FetchContent_Declare

```
FetchContent_Declare(

  <name>

  <contentOptions>...

  [EXCLUDE_FROM_ALL]

  [SYSTEM]

  [OVERRIDE_FIND_PACKAGE |

   FIND_PACKAGE_ARGS args...]
)
```

The FetchContent_Declare() function records the options that describe how to populate the specified content. If such details have already been recorded earlier in this project (regardless of where in the project hierarchy), this and all later calls for the same content <name> are ignored. This "first to record, wins" approach is what allows hierarchical projects to have parent projects override content details of child projects.

The content <name> can be any string without spaces, but good practice would be to use only letters, numbers, and underscores. The name will be treated case-insensitively, and it should be obvious for the content it represents. It is often the name of the child project, or the value given to its top level project() <#command:project> command (if it is a CMake project). For well-known public projects, the name should generally be the official name of the project. Choosing an unusual name makes it unlikely that other projects needing that same content will use the same name, leading to the content being populated multiple times.

The <contentOptions> can be any of the download, update, or patch options that the ExternalProject_Add() <#command:externalproject_add> command understands. The configure, build, install, and test steps are explicitly disabled, so options related to those steps are prohibited and will be discarded if given. The SOURCE_SUBDIR option is an exception, see FetchContent_MakeAvailable() for details on how that affects behavior.

Changed in version 3.30: When policy CMP0168 <#policy:CMP0168> is set to NEW, some output-related and directory-related options are ignored. See the policy documentation for details.

In most cases, <contentOptions> will just be a couple of options defining the download method and method-specific details like a commit tag or archive hash. For example:

```
FetchContent_Declare(

  googletest

  GIT_REPOSITORY https://github.com/google/googletest.git

  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
)
FetchContent_Declare(

  myCompanyIcons

  URL      https://intranet.mycompany.com/assets/iconset_1.12.tar.gz

  URL_HASH MD5=5588a7b18261c20068beabfb4f530b87
)
FetchContent_Declare(

  myCompanyCertificates

  SVN_REPOSITORY svn+ssh://svn.mycompany.com/srv/svn/trunk/certs

  SVN_REVISION   -r12345
)
```

Where contents are being fetched from a remote location and you do not control that server, it is advisable to use a hash for GIT_TAG rather than a branch or tag name. A commit hash is more secure and helps to confirm that the downloaded contents are what you expected.

Changed in version 3.14: Commands for the download, update, or patch steps can access the terminal. This may be needed for things like password prompts or real-time display of command progress.

Added in version 3.22: The CMAKE_TLS_VERIFY <#variable:CMAKE_TLS_VERIFY>, CMAKE_TLS_CAINFO <#variable:CMAKE_TLS_CAINFO>, CMAKE_NETRC <#variable:CMAKE_NETRC>, and CMAKE_NETRC_FILE <#variable:CMAKE_NETRC_FILE> variables now provide the defaults for their corresponding content options, just like they do for ExternalProject_Add() <#command:externalproject_add>. Previously, these variables were ignored by the FetchContent module.

Added in version 3.24:

FIND_PACKAGE_ARGS

This option is for scenarios where the FetchContent_MakeAvailable() command may first try a call to find_package() <#command:find_package> to satisfy the dependency for <name>. By default, such a call would be simply find_package(<name>), but FIND_PACKAGE_ARGS can be used to provide additional arguments to be appended after the <name>. FIND_PACKAGE_ARGS can also be given with nothing after it, which indicates that find_package() <#command:find_package> can still be called if FETCHCONTENT_TRY_FIND_PACKAGE_MODE is set to OPT_IN, or is not set. It would not normally be appropriate to specify REQUIRED as one of the additional arguments after FIND_PACKAGE_ARGS. Doing so would mean the find_package() <#command:find_package> call must succeed, so none of the other details specified in the FetchContent_Declare() call would get a chance to be used as a fall-back.

Everything after the FIND_PACKAGE_ARGS keyword is appended to the find_package() <#command:find_package> call, so all other <contentOptions> must come before the FIND_PACKAGE_ARGS keyword. If the CMAKE_FIND_PACKAGE_TARGETS_GLOBAL <#variable:CMAKE_FIND_PACKAGE_TARGETS_GLOBAL> variable is set to true at the time FetchContent_Declare() is called, a GLOBAL keyword will be appended to the find_package() <#command:find_package> arguments if it was not already specified. It will also be appended if FIND_PACKAGE_ARGS was not given, but FETCHCONTENT_TRY_FIND_PACKAGE_MODE was set to ALWAYS.

OVERRIDE_FIND_PACKAGE cannot be used when FIND_PACKAGE_ARGS is given.

Dependency Providers <#dependency-providers> discusses another way that FetchContent_MakeAvailable() calls can be redirected. FIND_PACKAGE_ARGS is intended for project control, whereas dependency providers allow users to override project behavior.

OVERRIDE_FIND_PACKAGE

When a FetchContent_Declare(<name> ...) call includes this option, subsequent calls to find_package(<name> ...) will ensure that FetchContent_MakeAvailable(<name>) has been called, then use the config package files in the CMAKE_FIND_PACKAGE_REDIRECTS_DIR <#variable:CMAKE_FIND_PACKAGE_REDIRECTS_DIR> directory (which are usually created by FetchContent_MakeAvailable()). This effectively makes FetchContent_MakeAvailable() override find_package() <#command:find_package> for the named dependency, allowing the former to satisfy the package requirements of the latter. FIND_PACKAGE_ARGS cannot be used when OVERRIDE_FIND_PACKAGE is given. If a dependency provider <#dependency-providers> has been set and the project calls find_package() <#command:find_package> for the <name> dependency, OVERRIDE_FIND_PACKAGE will not prevent the provider from seeing that call. Dependency providers always have the opportunity to intercept any direct call to find_package() <#command:find_package>, except if that call contains the BYPASS_PROVIDER option.

Added in version 3.25:

SYSTEM

If the SYSTEM argument is provided, the SYSTEM <#prop_dir:SYSTEM> directory property of a subdirectory added by FetchContent_MakeAvailable() will be set to true. This will affect non-imported targets created as part of that command. See the SYSTEM <#prop_tgt:SYSTEM> target property documentation for a more detailed discussion of the effects.

Added in version 3.28:

EXCLUDE_FROM_ALL

If the EXCLUDE_FROM_ALL argument is provided, then targets in the subdirectory added by FetchContent_MakeAvailable() will not be included in the ALL target by default, and may be excluded from IDE project files. See the documentation for the directory property EXCLUDE_FROM_ALL <#prop_dir:EXCLUDE_FROM_ALL> for a detailed discussion of the effects.

FetchContent_MakeAvailable

Added in version 3.14.

```
FetchContent_MakeAvailable(<name1> [<name2>...])
```

This command ensures that each of the named dependencies are made available to the project by the time it returns. There must have been a call to FetchContent_Declare() for each dependency, and the first such call will control how that dependency will be made available, as described below.

If <lowercaseName>_SOURCE_DIR is not set:

- Added in version 3.24: If a dependency provider <#dependency-providers> is set, call the provider's command with FETCHCONTENT_MAKEAVAILABLE_SERIAL as the first argument, followed by the arguments of the first call to FetchContent_Declare() for <name>. If SOURCE_DIR or BINARY_DIR were not part of the original declared arguments, they will be added with their default values. If FETCHCONTENT_TRY_FIND_PACKAGE_MODE was set to NEVER when the details were declared, any FIND_PACKAGE_ARGS will be omitted. The OVERRIDE_FIND_PACKAGE keyword is also always omitted. If the provider fulfilled the request, FetchContent_MakeAvailable() will consider that dependency handled, skip the remaining steps below, and move on to the next dependency in the list.

- Added in version 3.24: If permitted, find_package(<name> [<args>...]) <#command:find_package> will be called, where <args>... may be provided by the FIND_PACKAGE_ARGS option in FetchContent_Declare(). The value of the FETCHCONTENT_TRY_FIND_PACKAGE_MODE variable at the time FetchContent_Declare() was called determines whether FetchContent_MakeAvailable() can call find_package() <#command:find_package>. If the CMAKE_FIND_PACKAGE_TARGETS_GLOBAL <#variable:CMAKE_FIND_PACKAGE_TARGETS_GLOBAL> variable is set to true when FetchContent_MakeAvailable() is called, it still affects any imported targets created when that in turn calls find_package() <#command:find_package>, even if that variable was false when the corresponding details were declared.

If the dependency was not satisfied by a provider or a find_package() <#command:find_package> call, FetchContent_MakeAvailable() then uses the following logic to make the dependency available:

- If the dependency has already been populated earlier in this run, set the <lowercaseName>_POPULATED, <lowercaseName>_SOURCE_DIR, and <lowercaseName>_BINARY_DIR variables in the same way as a call to FetchContent_GetProperties(), then skip the remaining steps below and move on to the next dependency in the list.

- Populate the dependency using the details recorded by an earlier call to FetchContent_Declare(). Halt with a fatal error if no such details have been recorded. FETCHCONTENT_SOURCE_DIR_<uppercaseName> can be used to override the declared details and use content provided at the specified location instead.

- Added in version 3.24: Ensure the CMAKE_FIND_PACKAGE_REDIRECTS_DIR <#variable:CMAKE_FIND_PACKAGE_REDIRECTS_DIR> directory contains a <lowercaseName>-config.cmake and a <lowercaseName>-config-version.cmake file (or equivalently, <name>Config.cmake and <name>ConfigVersion.cmake). The directory that the CMAKE_FIND_PACKAGE_REDIRECTS_DIR <#variable:CMAKE_FIND_PACKAGE_REDIRECTS_DIR> variable points to is cleared at the start of every CMake run. If no config file exists after populating the dependency in the previous step, a minimal one will be written which includes <#command:include> any <lowercaseName>-extra.cmake or <name>Extra.cmake file with the OPTIONAL flag (so the files can be missing and won't generate a warning). Similarly, if no config version file exists, a very simple one will be written which sets PACKAGE_VERSION_COMPATIBLE and PACKAGE_VERSION_EXACT to true. This ensures all future calls to find_package() <#command:find_package> for the dependency will use the redirected config file, regardless of any version requirements. CMake cannot automatically determine an arbitrary dependency's version, so it cannot set PACKAGE_VERSION. When a dependency is pulled in via add_subdirectory() <#command:add_subdirectory> in the next step, it may choose to overwrite the generated config version file in CMAKE_FIND_PACKAGE_REDIRECTS_DIR <#variable:CMAKE_FIND_PACKAGE_REDIRECTS_DIR> with one that also sets PACKAGE_VERSION. The dependency may also write a <lowercaseName>-extra.cmake or <name>Extra.cmake file to perform custom processing, or define any variables that their normal (installed) package config file would otherwise usually define (many projects don't do any custom processing or set any variables and therefore have no need to do this). If required, the main project can write these files instead if the dependency project doesn't do so. This allows the main project to add missing details from older dependencies that haven't or can't be updated to support this functionality. See Integrating With find_package() for examples.

- If the top directory of the populated content contains a CMakeLists.txt file, call add_subdirectory() <#command:add_subdirectory> to add it to the main build. It is not an error for there to be no CMakeLists.txt file, which allows the command to be used for dependencies that make downloaded content available at a known location, but which do not need or support being added directly to the build. Added in version 3.18: The SOURCE_SUBDIR option can be given in the declared details to look somewhere below the top directory instead (i.e. the same way that SOURCE_SUBDIR is used by the ExternalProject_Add() <#command:externalproject_add> command). The path provided with SOURCE_SUBDIR must be relative, and it will be treated as relative to the top directory. It can also point to a directory that does not contain a CMakeLists.txt file, or even to a directory that doesn't exist. This can be used to avoid adding a project that contains a CMakeLists.txt file in its top directory.

Added in version 3.25: If the SYSTEM keyword was included in the call to FetchContent_Declare(), the SYSTEM keyword will be added to the add_subdirectory() <#command:add_subdirectory> command.

Added in version 3.28: If the EXCLUDE_FROM_ALL keyword was included in the call to FetchContent_Declare(), the EXCLUDE_FROM_ALL keyword will be added to the add_subdirectory() <#command:add_subdirectory> command.

Added in version 3.29: CMAKE_EXPORT_FIND_PACKAGE_NAME <#variable:CMAKE_EXPORT_FIND_PACKAGE_NAME> is set to the dependency name before calling add_subdirectory() <#command:add_subdirectory>.

Projects should aim to declare the details of all dependencies they might use before they call FetchContent_MakeAvailable() for any of them. This ensures that if any of the dependencies are also sub-dependencies of one or more of the others, the main project still controls the details that will be used (because it will declare them first before the dependencies get a chance to). In the following code samples, assume that the uses_other dependency also uses FetchContent to add the other dependency internally:

```
# WRONG: Should declare all details first
FetchContent_Declare(uses_other ...)
FetchContent_MakeAvailable(uses_other)
FetchContent_Declare(other ...)    # Will be ignored, uses_other beat us to it
FetchContent_MakeAvailable(other)  # Would use details declared by uses_other
```

```
# CORRECT: All details declared first, so they will take priority
FetchContent_Declare(uses_other ...)
FetchContent_Declare(other ...)
FetchContent_MakeAvailable(uses_other other)
```

Note that CMAKE_VERIFY_INTERFACE_HEADER_SETS <#variable:CMAKE_VERIFY_INTERFACE_HEADER_SETS> and CMAKE_VERIFY_PRIVATE_HEADER_SETS <#variable:CMAKE_VERIFY_PRIVATE_HEADER_SETS> are explicitly set to false upon entry to FetchContent_MakeAvailable(), and are restored to their original values before the command returns. Developers typically only want to verify header sets from the main project, not those from any dependencies. This local manipulation of the CMAKE_VERIFY_INTERFACE_HEADER_SETS <#variable:CMAKE_VERIFY_INTERFACE_HEADER_SETS> and CMAKE_VERIFY_PRIVATE_HEADER_SETS <#variable:CMAKE_VERIFY_PRIVATE_HEADER_SETS> variables provides that intuitive behavior. You can use variables like CMAKE_PROJECT_INCLUDE <#variable:CMAKE_PROJECT_INCLUDE> or CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE <#variable:CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE> to turn verification back on for all or some dependencies. You can also set the VERIFY_INTERFACE_HEADER_SETS <#prop_tgt:VERIFY_INTERFACE_HEADER_SETS> and VERIFY_PRIVATE_HEADER_SETS <#prop_tgt:VERIFY_PRIVATE_HEADER_SETS> properties of individual targets.

FetchContent_Populate

The FetchContent_Populate() command is a self-contained call which can be used to perform content population as an isolated operation. It is rarely the right command to use, projects should almost always use FetchContent_Declare() and FetchContent_MakeAvailable() instead. The main use case for FetchContent_Populate() is in CMake script mode <#script-processing-mode> as part of implementing some other higher level custom feature.

```
FetchContent_Populate(

  <name>

  [QUIET]

  [SUBBUILD_DIR <subBuildDir>]

  [SOURCE_DIR <srcDir>]

  [BINARY_DIR <binDir>]

  ...
)
```

At least one option must be specified after <name>, otherwise the call is interpreted differently (see below). The supported options for FetchContent_Populate() are the same as those for FetchContent_Declare(), with a few exceptions. The following do not relate to populating content with FetchContent_Populate() and therefore are not supported:

- EXCLUDE_FROM_ALL

- SYSTEM

- OVERRIDE_FIND_PACKAGE

- FIND_PACKAGE_ARGS

The few options shown in the signature above are either specific to FetchContent_Populate(), or their behavior is slightly modified from how ExternalProject_Add() <#command:externalproject_add> treats them:

QUIET

The QUIET option can be given to hide the output associated with populating the specified content. If the population fails, the output will be shown regardless of whether this option was given or not so that the cause of the failure can be diagnosed. The FETCHCONTENT_QUIET variable has no effect on FetchContent_Populate() calls of this form where the content details are provided directly. Changed in version 3.30: The QUIET option and FETCHCONTENT_QUIET variable have no effect when policy CMP0168 <#policy:CMP0168> is set to NEW. The output is still quiet by default in that case, but verbosity is controlled by the message logging level (see CMAKE_MESSAGE_LOG_LEVEL <#variable:CMAKE_MESSAGE_LOG_LEVEL> and --log-level <#cmdoption-cmake-log-level>).

SUBBUILD_DIR

The SUBBUILD_DIR argument can be provided to change the location of the sub-build created to perform the population. The default value is ${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-subbuild, and it would be unusual to need to override this default. If a relative path is specified, it will be interpreted as relative to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>. This option should not be confused with the SOURCE_SUBDIR option, which only affects the FetchContent_MakeAvailable() command. Changed in version 3.30: SUBBUILD_DIR is ignored when policy CMP0168 <#policy:CMP0168> is set to NEW, since there is no sub-build in that case.

SOURCE_DIR, BINARY_DIR

The SOURCE_DIR and BINARY_DIR arguments are supported by ExternalProject_Add() <#command:externalproject_add>, but different default values are used by FetchContent_Populate(). SOURCE_DIR defaults to ${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-src, and BINARY_DIR defaults to ${CMAKE_CURRENT_BINARY_DIR}/<lowercaseName>-build. If a relative path is specified, it will be interpreted as relative to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>.

In addition to the above explicit options, any other unrecognized options are passed through unmodified to ExternalProject_Add() <#command:externalproject_add> to set up the download, patch, and update steps. The following options are explicitly prohibited (they are disabled by the FetchContent_Populate() command):

- CONFIGURE_COMMAND

- BUILD_COMMAND

- INSTALL_COMMAND

- TEST_COMMAND

With this form, the FETCHCONTENT_FULLY_DISCONNECTED and FETCHCONTENT_UPDATES_DISCONNECTED variables and policy CMP0170 <#policy:CMP0170> are ignored.

When this form of FetchContent_Populate() returns, the following variables will be set in the scope of the caller:

<lowercaseName>_SOURCE_DIR

The location where the populated content can be found upon return.

<lowercaseName>_BINARY_DIR

A directory originally intended for use as a corresponding build directory, but is unlikely to be relevant when using this form of the command.

If using FetchContent_Populate() within CMake script mode <#script-processing-mode>, be aware that the implementation sets up a sub-build which therefore requires a CMake generator and build tool to be available. If these cannot be found by default, then the CMAKE_GENERATOR <#variable:CMAKE_GENERATOR> and potentially the CMAKE_MAKE_PROGRAM <#variable:CMAKE_MAKE_PROGRAM> variables will need to be set appropriately on the command line invoking the script.

Changed in version 3.30: If policy CMP0168 <#policy:CMP0168> is set to NEW, no sub-build is used. Within CMake script mode <#script-processing-mode>, that allows FetchContent_Populate() to be called without any build tool or CMake generator.

Added in version 3.18: Added support for the DOWNLOAD_NO_EXTRACT option.

The command supports another form, although it should no longer be used:

```
FetchContent_Populate(<name>)
```

Changed in version 3.30: This form is deprecated. Policy CMP0169 <#policy:CMP0169> provides backward compatibility for projects that still need to use this form, but projects should be updated to use FetchContent_MakeAvailable() instead.

In this form, the only argument given to FetchContent_Populate() is the <name>. When used this way, the command assumes the content details have been recorded by an earlier call to FetchContent_Declare(). The details are stored in a global property, so they are unaffected by things like variable or directory scope. Therefore, it doesn't matter where in the project the details were previously declared, as long as they have been declared before the call to FetchContent_Populate(). Those saved details are then used to populate the content using a method based on ExternalProject_Add() <#command:externalproject_add> (see policy CMP0168 <#policy:CMP0168> for important behavioral aspects of how that is done).

When this form of FetchContent_Populate() returns, the following variables will be set in the scope of the caller:

<lowercaseName>_POPULATED

This will always be set to TRUE by the call.

<lowercaseName>_SOURCE_DIR

The location where the populated content can be found upon return.

<lowercaseName>_BINARY_DIR

A directory intended for use as a corresponding build directory.

The values of the three variables can also be retrieved from anywhere in the project hierarchy using the FetchContent_GetProperties() command.

The implementation ensures that if the content has already been populated in a previous CMake run, that content will be reused rather than repopulating again. For the common case where population involves downloading content, the cost of the download is only paid once. But note that it is an error to call FetchContent_Populate(<name>) with the same <name> more than once within a single CMake run. See FetchContent_GetProperties() for how to determine if population of a <name> has already been performed in the current run.

FetchContent_GetProperties

When using saved content details, a call to FetchContent_MakeAvailable() or FetchContent_Populate() records information in global properties which can be queried at any time. This information may include the source and binary directories associated with the content, and also whether or not the content population has been processed during the current configure run.

```
FetchContent_GetProperties(

  <name>

  [SOURCE_DIR <srcDirVar>]

  [BINARY_DIR <binDirVar>]

  [POPULATED <doneVar>]
)
```

The SOURCE_DIR, BINARY_DIR, and POPULATED options can be used to specify which properties should be retrieved. Each option accepts a value which is the name of the variable in which to store that property. Most of the time though, only <name> is given, in which case the call will then set the same variables as a call to FetchContent_MakeAvailable(name) or FetchContent_Populate(name). Note that the SOURCE_DIR and BINARY_DIR values can be empty if the call is fulfilled by a dependency provider <#dependency-providers>.

This command is rarely needed when using FetchContent_MakeAvailable(). It is more commonly used as part of implementing the deprecated pattern with FetchContent_Populate(), which ensures that the relevant variables will always be defined regardless of whether or not the population has been performed elsewhere in the project already:

```
# WARNING: This pattern is deprecated, don't use it!
#
# Check if population has already been performed
FetchContent_GetProperties(depname)
if(NOT depname_POPULATED)

  # Fetch the content using previously declared details

  FetchContent_Populate(depname)

  # Set custom variables, policies, etc.

  # ...

  # Bring the populated content into the build

  add_subdirectory(${depname_SOURCE_DIR} ${depname_BINARY_DIR})
endif()
```

FetchContent_SetPopulated

Added in version 3.24.

Note:

This command should only be called by dependency providers <#dependency-providers>. Calling it in any other context is unsupported and future CMake versions may halt with a fatal error in such cases.

```
FetchContent_SetPopulated(

  <name>

  [SOURCE_DIR <srcDir>]

  [BINARY_DIR <binDir>]
)
```

If a provider command fulfills a FETCHCONTENT_MAKEAVAILABLE_SERIAL request, it must call this function before returning. The SOURCE_DIR and BINARY_DIR arguments can be used to specify the values that FetchContent_GetProperties() should return for its corresponding arguments. Only provide SOURCE_DIR and BINARY_DIR if they have the same meaning as if they had been populated by the built-in FetchContent_MakeAvailable() implementation.

### Variables
A number of cache variables can influence the behavior where details from a FetchContent_Declare() call are used to populate content.

Note:

All of these variables are intended for the developer to customize behavior. They should not normally be set by the project.

FETCHCONTENT_BASE_DIR

In most cases, the saved details do not specify any options relating to the directories to use for the internal sub-build, final source, and build areas. It is generally best to leave these decisions up to the FetchContent module to handle on the project's behalf. The FETCHCONTENT_BASE_DIR cache variable controls the point under which all content population directories are collected, but in most cases, developers would not need to change this. The default location is ${CMAKE_BINARY_DIR}/_deps, but if developers change this value, they should aim to keep the path short and just below the top level of the build tree to avoid running into path length problems on Windows.

FETCHCONTENT_QUIET

The logging output during population can be quite verbose, making the configure stage quite noisy. This cache option (ON by default) hides all population output unless an error is encountered. If experiencing problems with hung downloads, temporarily switching this option off may help diagnose which content population is causing the issue. Changed in version 3.30: FETCHCONTENT_QUIET is ignored if policy CMP0168 <#policy:CMP0168> is set to NEW. The output is still quiet by default in that case, but verbosity is controlled by the message logging level (see CMAKE_MESSAGE_LOG_LEVEL <#variable:CMAKE_MESSAGE_LOG_LEVEL> and --log-level <#cmdoption-cmake-log-level>).

FETCHCONTENT_FULLY_DISCONNECTED

When this option is enabled, no attempt is made to download or update any content. It is assumed that all content has already been populated in a previous run, or the source directories have been pointed at existing contents the developer has provided manually (using options described further below). When the developer knows that no changes have been made to any content details, turning this option ON can speed up the configure stage. It is OFF by default. Note:

The FETCHCONTENT_FULLY_DISCONNECTED variable is not an appropriate way to prevent any network access on the first run in a build directory. Doing so can break projects, lead to misleading error messages, and hide subtle population failures. This variable is specifically intended to only be turned on after the first time CMake has been run. If you want to prevent network access even on the first run, use a dependency provider <#dependency-providers> and populate the dependency from local content instead.

Changed in version 3.30: The constraint that the source directory has already been populated when FETCHCONTENT_FULLY_DISCONNECTED is true is now enforced. See policy CMP0170 <#policy:CMP0170>.

FETCHCONTENT_UPDATES_DISCONNECTED

This is a less severe download/update control compared to FETCHCONTENT_FULLY_DISCONNECTED. Instead of bypassing all download and update logic, FETCHCONTENT_UPDATES_DISCONNECTED only prevents the update step from making connections to remote servers when using the git or hg download methods. Updates still occur if details about the update step change, but the update is attempted with only the information already available locally (so switching to a different tag or commit that is already fetched locally will succeed, but switching to an unknown commit hash will fail). The download step is not affected, so if content has not been downloaded previously, it will still be downloaded when this option is enabled. This can speed up the configure step, but not as much as FETCHCONTENT_FULLY_DISCONNECTED. FETCHCONTENT_UPDATES_DISCONNECTED is OFF by default.

FETCHCONTENT_TRY_FIND_PACKAGE_MODE

Added in version 3.24.

This variable modifies the details that FetchContent_Declare() records for a given dependency. While it ultimately controls the behavior of FetchContent_MakeAvailable(), it is the variable's value when FetchContent_Declare() is called that gets used. It makes no difference what the variable is set to when FetchContent_MakeAvailable() is called. Since the variable should only be set by the user and not by projects directly, it will typically have the same value throughout anyway, so this distinction is not usually noticeable.

FETCHCONTENT_TRY_FIND_PACKAGE_MODE ultimately controls whether FetchContent_MakeAvailable() is allowed to call find_package() <#command:find_package> to satisfy a dependency. The variable can be set to one of the following values:

OPT_IN

FetchContent_MakeAvailable() will only call find_package() <#command:find_package> if the FetchContent_Declare() call included a FIND_PACKAGE_ARGS keyword. This is also the default behavior if FETCHCONTENT_TRY_FIND_PACKAGE_MODE is not set.

ALWAYS

find_package() <#command:find_package> can be called by FetchContent_MakeAvailable() regardless of whether the FetchContent_Declare() call included a FIND_PACKAGE_ARGS keyword or not. If no FIND_PACKAGE_ARGS keyword was given, the behavior will be as though FIND_PACKAGE_ARGS had been provided, with no additional arguments after it.

NEVER

FetchContent_MakeAvailable() will not call find_package() <#command:find_package>. Any FIND_PACKAGE_ARGS given to the FetchContent_Declare() call will be ignored.

As a special case, if the FETCHCONTENT_SOURCE_DIR_<uppercaseName> variable has a non-empty value for a dependency, it is assumed that the user is overriding all other methods of making that dependency available. FETCHCONTENT_TRY_FIND_PACKAGE_MODE will have no effect on that dependency and FetchContent_MakeAvailable() will not try to call find_package() <#command:find_package> for it.

In addition to the above, the following variables are also defined for each content name:

FETCHCONTENT_SOURCE_DIR_<uppercaseName>

If this is set, no download or update steps are performed for the specified content and the <lowercaseName>_SOURCE_DIR variable returned to the caller is pointed at this location. This gives developers a way to have a separate checkout of the content that they can modify freely without interference from the build. The build simply uses that existing source, but it still defines <lowercaseName>_BINARY_DIR to point inside its own build area. Developers are strongly encouraged to use this mechanism rather than editing the sources populated in the default location, as changes to sources in the default location can be lost when content population details are changed by the project.

FETCHCONTENT_UPDATES_DISCONNECTED_<uppercaseName>

This is the per-content equivalent of FETCHCONTENT_UPDATES_DISCONNECTED. If the global option or this option is ON, then updates for the git and hg methods will not contact any remote for the named content. They will only use information already available locally. Disabling updates for individual content can be useful for content whose details rarely change, while still leaving other frequently changing content with updates enabled.

### Typical Case
This first fairly straightforward example ensures that some popular testing frameworks are available to the main build:

```
include(FetchContent)
FetchContent_Declare(

  googletest

  GIT_REPOSITORY https://github.com/google/googletest.git

  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0
)
FetchContent_Declare(

  Catch2

  GIT_REPOSITORY https://github.com/catchorg/Catch2.git

  GIT_TAG        605a34765aa5d5ecbf476b4598a862ada971b0cc # v3.0.1
)
# After the following call, the CMake targets defined by googletest and
# Catch2 will be available to the rest of the build
FetchContent_MakeAvailable(googletest Catch2)
```

### Integrating With find_package()
For the previous example, if the user wanted to try to find googletest and Catch2 via find_package() <#command:find_package> first before trying to download and build them from source, they could set the FETCHCONTENT_TRY_FIND_PACKAGE_MODE variable to ALWAYS. This would also affect any other calls to FetchContent_Declare() throughout the project, which might not be acceptable. The behavior can be enabled for just these two dependencies instead by adding FIND_PACKAGE_ARGS to the declared details and leaving FETCHCONTENT_TRY_FIND_PACKAGE_MODE unset, or set to OPT_IN:

```
include(FetchContent)
FetchContent_Declare(

  googletest

  GIT_REPOSITORY https://github.com/google/googletest.git

  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0

  FIND_PACKAGE_ARGS NAMES GTest
)
FetchContent_Declare(

  Catch2

  GIT_REPOSITORY https://github.com/catchorg/Catch2.git

  GIT_TAG        605a34765aa5d5ecbf476b4598a862ada971b0cc # v3.0.1

  FIND_PACKAGE_ARGS
)
# This will try calling find_package() first for both dependencies
FetchContent_MakeAvailable(googletest Catch2)
```

For Catch2, no additional arguments to find_package() <#command:find_package> are needed, so no additional arguments are provided after the FIND_PACKAGE_ARGS keyword. For googletest, its package is more commonly called GTest, so arguments are added to support it being found by that name.

If the user wanted to disable FetchContent_MakeAvailable() from calling find_package() <#command:find_package> for any dependency, even if it provided FIND_PACKAGE_ARGS in its declared details, they could set FETCHCONTENT_TRY_FIND_PACKAGE_MODE to NEVER.

If the project wanted to indicate that these two dependencies should be downloaded and built from source and that find_package() <#command:find_package> calls should be redirected to use the built dependencies, the OVERRIDE_FIND_PACKAGE option should be used when declaring the content details:

```
include(FetchContent)
FetchContent_Declare(

  googletest

  GIT_REPOSITORY https://github.com/google/googletest.git

  GIT_TAG        703bd9caab50b139428cea1aaff9974ebee5742e # release-1.10.0

  OVERRIDE_FIND_PACKAGE
)
FetchContent_Declare(

  Catch2

  GIT_REPOSITORY https://github.com/catchorg/Catch2.git

  GIT_TAG        605a34765aa5d5ecbf476b4598a862ada971b0cc # v3.0.1

  OVERRIDE_FIND_PACKAGE
)
# The following will automatically forward through to FetchContent_MakeAvailable()
find_package(googletest)
find_package(Catch2)
```

CMake provides a FindGTest module which defines some variables that older projects may use instead of linking to the imported targets. To support those cases, we can provide an extra file. In keeping with the "first to define, wins" philosophy of FetchContent, we only write out that file if something else hasn't already done so.

```
FetchContent_MakeAvailable(googletest)
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-extra.cmake AND

   NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletestExtra.cmake)

  file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-extra.cmake
[=[
if("${GTEST_LIBRARIES}" STREQUAL "" AND TARGET GTest::gtest)

  set(GTEST_LIBRARIES GTest::gtest)
endif()
if("${GTEST_MAIN_LIBRARIES}" STREQUAL "" AND TARGET GTest::gtest_main)

  set(GTEST_MAIN_LIBRARIES GTest::gtest_main)
endif()
if("${GTEST_BOTH_LIBRARIES}" STREQUAL "")

  set(GTEST_BOTH_LIBRARIES ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES})
endif()
]=])
endif()
```

Projects will also likely be using find_package(GTest) rather than find_package(googletest), but it is possible to make use of the CMAKE_FIND_PACKAGE_REDIRECTS_DIR <#variable:CMAKE_FIND_PACKAGE_REDIRECTS_DIR> area to pull in the latter as a dependency of the former. This is likely to be sufficient to satisfy a typical find_package(GTest) call.

```
FetchContent_MakeAvailable(googletest)
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config.cmake AND

   NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/GTestConfig.cmake)

  file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config.cmake
[=[
include(CMakeFindDependencyMacro)
find_dependency(googletest)
]=])
endif()
if(NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config-version.cmake AND

   NOT EXISTS ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/GTestConfigVersion.cmake)

  file(WRITE ${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/gtest-config-version.cmake
[=[
include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletest-config-version.cmake OPTIONAL)
if(NOT PACKAGE_VERSION_COMPATIBLE)

  include(${CMAKE_FIND_PACKAGE_REDIRECTS_DIR}/googletestConfigVersion.cmake OPTIONAL)
endif()
]=])
endif()
```

### Overriding Where To Find CMakeLists.txt
If the sub-project's CMakeLists.txt file is not at the top level of its source tree, the SOURCE_SUBDIR option can be used to tell FetchContent where to find it. The following example shows how to use that option, and it also sets a variable which is meaningful to the subproject before pulling it into the main build (set as an INTERNAL cache variable to avoid problems with policy CMP0077 <#policy:CMP0077>):

```
include(FetchContent)
FetchContent_Declare(

  protobuf

  GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git

  GIT_TAG        ae50d9b9902526efd6c7a1907d09739f959c6297 # v3.15.0

  SOURCE_SUBDIR  cmake
)
set(protobuf_BUILD_TESTS OFF CACHE INTERNAL "")
FetchContent_MakeAvailable(protobuf)
```

### Complex Dependency Hierarchies
In more complex project hierarchies, the dependency relationships can be more complicated. Consider a hierarchy where projA is the top level project and it depends directly on projects projB and projC. Both projB and projC can be built standalone and they also both depend on another project projD. projB additionally depends on projE. This example assumes that all five projects are available on a company git server. The CMakeLists.txt of each project might have sections like the following:

projA

```
include(FetchContent)
FetchContent_Declare(

  projB

  GIT_REPOSITORY git@mycompany.com:git/projB.git

  GIT_TAG        4a89dc7e24ff212a7b5167bef7ab079d
)
FetchContent_Declare(

  projC

  GIT_REPOSITORY git@mycompany.com:git/projC.git

  GIT_TAG        4ad4016bd1d8d5412d135cf8ceea1bb9
)
FetchContent_Declare(

  projD

  GIT_REPOSITORY git@mycompany.com:git/projD.git

  GIT_TAG        origin/integrationBranch
)
FetchContent_Declare(

  projE

  GIT_REPOSITORY git@mycompany.com:git/projE.git

  GIT_TAG        v2.3-rc1
)
# Order is important, see notes in the discussion further below
FetchContent_MakeAvailable(projD projB projC)
```

projB

```
include(FetchContent)
FetchContent_Declare(

  projD

  GIT_REPOSITORY git@mycompany.com:git/projD.git

  GIT_TAG        20b415f9034bbd2a2e8216e9a5c9e632
)
FetchContent_Declare(

  projE

  GIT_REPOSITORY git@mycompany.com:git/projE.git

  GIT_TAG        68e20f674a48be38d60e129f600faf7d
)
FetchContent_MakeAvailable(projD projE)
```

projC

```
include(FetchContent)
FetchContent_Declare(

  projD

  GIT_REPOSITORY git@mycompany.com:git/projD.git

  GIT_TAG        7d9a17ad2c962aa13e2fbb8043fb6b8a
)
FetchContent_MakeAvailable(projD)
```

A few key points should be noted in the above:

- projB and projC define different content details for projD, but projA also defines a set of content details for projD. Because projA will define them first, the details from projB and projC will not be used. The override details defined by projA are not required to match either of those from projB or projC, but it is up to the higher level project to ensure that the details it does define still make sense for the child projects.

- In the projA call to FetchContent_MakeAvailable(), projD is listed ahead of projB and projC, so it will be populated before either projB or projC. It isn't required for projA to do this, doing so ensures that projA fully controls the environment in which projD is brought into the build (directory properties are particularly relevant).

- While projA defines content details for projE, it does not need to explicitly call FetchContent_MakeAvailable(projE) or FetchContent_Populate(projD) itself. Instead, it leaves that to the child projB. For higher level projects, it is often enough to just define the override content details and leave the actual population to the child projects. This saves repeating the same thing at each level of the project hierarchy unnecessarily, but it should only be done if directory properties set by dependencies are not expected to influence the population of the shared dependency (projE in this case).

### Populating Content Without Adding It To The Build
Projects don't always need to add the populated content to the build. Sometimes the project just wants to make the downloaded content available at a predictable location. The next example ensures that a set of standard company toolchain files (and potentially even the toolchain binaries themselves) is available early enough to be used for that same build.

```
cmake_minimum_required(VERSION 3.14)
include(FetchContent)
FetchContent_Declare(

  mycom_toolchains

  URL  https://intranet.mycompany.com//toolchains_1.3.2.tar.gz
)
FetchContent_MakeAvailable(mycom_toolchains)
project(CrossCompileExample)
```

The project could be configured to use one of the downloaded toolchains like so:

```
cmake -DCMAKE_TOOLCHAIN_FILE=_deps/mycom_toolchains-src/toolchain_arm.cmake /path/to/src
```

When CMake processes the CMakeLists.txt file, it will download and unpack the tarball into _deps/mycompany_toolchains-src relative to the build directory. The CMAKE_TOOLCHAIN_FILE <#variable:CMAKE_TOOLCHAIN_FILE> variable is not used until the project() <#command:project> command is reached, at which point CMake looks for the named toolchain file relative to the build directory. Because the tarball has already been downloaded and unpacked by then, the toolchain file will be in place, even the very first time that cmake is run in the build directory.

### Populating Content In CMake Script Mode
This last example demonstrates how one might download and unpack a firmware tarball using CMake's script mode <#script-processing-mode>. The call to FetchContent_Populate() specifies all the content details and the unpacked firmware will be placed in a firmware directory below the current working directory.

getFirmware.cmake

```
# NOTE: Intended to be run in script mode with cmake -P
include(FetchContent)
FetchContent_Populate(

  firmware

  URL        https://mycompany.com/assets/firmware-1.23-arm.tar.gz

  URL_HASH   MD5=68247684da89b608d466253762b0ff11

  SOURCE_DIR firmware
)
```

### FindPackageHandleStandardArgs
This module provides commands intended for use in Find Modules <#find-modules> implementing find_package(<PackageName>) <#command:find_package> calls.

Load this module in a CMake find module with:

FindFoo.cmake

```
include(FindPackageHandleStandardArgs)
```

### Commands
This module provides the following commands:

- find_package_handle_standard_args()

- find_package_check_version()

find_package_handle_standard_args

Handles the REQUIRED, QUIET and version-related arguments of find_package() <#command:find_package>. There are two signatures:

```
find_package_handle_standard_args(

  <PackageName>

  (DEFAULT_MSG|<custom-failure-message>)

  <required-vars>...
)
find_package_handle_standard_args(

  <PackageName>

  [REQUIRED_VARS <required-vars>...]

  [VERSION_VAR <version-var>]

  [HANDLE_VERSION_RANGE]

  [HANDLE_COMPONENTS]

  [CONFIG_MODE]

  [NAME_MISMATCHED]

  [REASON_FAILURE_MESSAGE <reason-failure-message>]

  [FAIL_MESSAGE <custom-failure-message>]

  [FOUND_VAR <result-var>] # Deprecated
)
```

This command sets the <PackageName>_FOUND variable to TRUE if all the variables listed in <required-vars>... contain valid results (e.g., valid filepaths) and any optional constraints are satisfied, and FALSE otherwise. A success or failure message may be displayed based on the results and on whether the REQUIRED and/or QUIET option was given to the find_package() <#command:find_package> call.

The arguments are:

<PackageName>

The name of the package. For example, as written in the Find<PackageName>.cmake find module filename.

(DEFAULT_MSG|<custom-failure-message>)

In the simple signature this specifies the failure message. Use DEFAULT_MSG to ask for a default message to be computed (recommended). Not valid in the full signature.

REQUIRED_VARS <required-vars>...

Specify the variables which are required for this package. These may be named in the generated failure message asking the user to set the missing variable values. Therefore these should typically be cache entries such as Foo_LIBRARY and not output variables like Foo_LIBRARIES. Changed in version 3.18: If HANDLE_COMPONENTS is specified, this option can be omitted.

VERSION_VAR <version-var>

Specify the name of a variable that holds the version of the package that has been found. This version will be checked against the (potentially) specified required version given to the find_package() <#command:find_package> call, including its EXACT option. The default messages include information about the required version and the version which has been actually found, both if the version is ok or not.

HANDLE_VERSION_RANGE

Added in version 3.19.

Enable handling of a version range, if one is specified. Without this option, a developer warning will be displayed if a version range is specified.

HANDLE_COMPONENTS

Enable handling of package components. In this case, the command will report which components have been found and which are missing, and the <PackageName>_FOUND variable will be set to FALSE if any of the required components (i.e. not the ones listed after the OPTIONAL_COMPONENTS option of find_package() <#command:find_package>) are missing.

CONFIG_MODE

Specify that the calling find module is a wrapper around a call to find_package(<PackageName> NO_MODULE). This implies a VERSION_VAR value of <PackageName>_VERSION. The command will automatically check whether the package configuration file was found.

NAME_MISMATCHED

Added in version 3.17.

Indicate that the <PackageName> does not match the value of CMAKE_FIND_PACKAGE_NAME <#variable:CMAKE_FIND_PACKAGE_NAME> variable. This is usually a mistake and raises a warning, but it may be intentional for usage of the command for components of a larger package.

REASON_FAILURE_MESSAGE <reason-failure-message>

Added in version 3.16.

Specify a custom message of the reason for the failure which will be appended to the default generated message.

FAIL_MESSAGE <custom-failure-message>

Specify a custom failure message instead of using the default generated message. Not recommended.

FOUND_VAR <result-var>

Deprecated since version 3.3: This option should no longer be used.

Specifies either <PackageName>_FOUND or <PACKAGENAME>_FOUND as the result variable. This exists only for backward compatibility with older versions of CMake and is now ignored. Result variables of both names are now always set for compatibility also with or without this option.

Note:

If <PackageName> does not match CMAKE_FIND_PACKAGE_NAME <#variable:CMAKE_FIND_PACKAGE_NAME> for the calling module, a warning that there is a mismatch is given. The FPHSA_NAME_MISMATCHED variable may be set to bypass the warning if using the old signature and the NAME_MISMATCHED argument using the new signature. To avoid forcing the caller to require newer versions of CMake for usage, the variable's value will be used if defined when the NAME_MISMATCHED argument is not passed for the new signature (but using both is an error).

find_package_check_version

Added in version 3.19.

Checks if a given version is valid against the version-related arguments of find_package() <#command:find_package>:

```
find_package_check_version(

  <version>

  <result-var>

  [HANDLE_VERSION_RANGE]

  [RESULT_MESSAGE_VARIABLE <message-var>]
)
```

The arguments are:

<version>

The version string to check.

<result-var>

Name of the result variable that will hold a boolean value giving the result of the check.

HANDLE_VERSION_RANGE

Enable handling of a version range, if one is specified. Without this option, a developer warning will be displayed if a version range is specified.

RESULT_MESSAGE_VARIABLE <message-var>

Specify a variable to get back a message describing the result of the check.

### Examples: Full Signature
Example for using a full signature of find_package_handle_standard_args():

FindLibArchive.cmake

```
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(

  LibArchive

  REQUIRED_VARS LibArchive_LIBRARY LibArchive_INCLUDE_DIR

  VERSION_VAR LibArchive_VERSION
)
```

In this case, the LibArchive package is considered to be found if both LibArchive_LIBRARY and LibArchive_INCLUDE_DIR are valid. Also the version of LibArchive will be checked by using the version contained in LibArchive_VERSION. Since no FAIL_MESSAGE is given, the default messages will be printed.

Another example for the full signature of find_package_handle_standard_args():

FindAutomoc4.cmake

```
find_package(Automoc4 QUIET NO_MODULE HINTS /opt/automoc4)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Automoc4 CONFIG_MODE)
```

In this case, a FindAutomoc4.cmake module wraps a call to find_package(Automoc4 NO_MODULE) and adds an additional search directory for automoc4. Then the call to find_package_handle_standard_args() produces a proper success/failure message.

### Example: Simple Signature
Example for using a simple signature of find_package_handle_standard_args():

FindLibXml2.cmake

```
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(

  LibXml2

  DEFAULT_MSG

  LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR
)
```

In this example, the LibXml2 package is considered to be found if both LIBXML2_LIBRARY and LIBXML2_INCLUDE_DIR variables are valid. Then also LibXml2_FOUND is set to TRUE. If it is not found and REQUIRED was used, it fails with a message(FATAL_ERROR) <#command:message>, independent whether QUIET was used or not. If it is found, success will be reported, including the content of the first required variable specified in <required-vars>.... On repeated CMake runs, the same message will not be printed again.

### Example: Checking Version
Example for the find_package_check_version() usage:

FindFoo.cmake

```
include(FindPackageHandleStandardArgs)
find_package_check_version(

  1.2.3

  result

  HANDLE_VERSION_RANGE

  RESULT_MESSAGE_VARIABLE reason
)
if(result)

  message(STATUS "${reason}")
else()

  # Logic when version check is not successful.

  message(WARNING "${reason}")
endif()
```

### See Also
•

Find Modules <#find-modules> for details how to write a find module.

### FindPackageMessage
This module provides a command for printing find result messages and is intended for use in Find Modules <#find-modules> implementing find_package(<PackageName>) <#command:find_package> calls.

Load this module in a CMake find module with:

FindFoo.cmake

```
include(FindPackageMessage)
```

### Commands
This module provides the following command:

find_package_message

Prints a message once for each unique find result to inform the user which package was found and where:

```
find_package_message(<PackageName> <message> <details>)
```

<PackageName>

The name of the package (for example, as used in the Find<PackageName>.cmake module filename).

<message>

The message string to display.

<details>

A unique identifier for tracking message display. The <message> is printed only once per distinct <details> value. If <details> string changes in a subsequent configuration phase, the message will be displayed again.

If find_package() <#command:find_package> was called with the QUIET option, the <message> is not printed.

### Examples
Printing a result message in a custom find module:

FindFoo.cmake

```
find_library(Foo_LIBRARY foo)
find_path(Foo_INCLUDE_DIR foo.h)
include(FindPackageMessage)
if(Foo_LIBRARY AND Foo_INCLUDE_DIR)

  find_package_message(

    Foo

    "Found Foo: ${Foo_LIBRARY}"

    "[${Foo_LIBRARY}][${Foo_INCLUDE_DIR}]"

  )
else()

  message(STATUS "Could NOT find Foo")
endif()
```

When writing standard find modules, use the FindPackageHandleStandardArgs <#module:FindPackageHandleStandardArgs> module and its find_package_handle_standard_args() <#command:find_package_handle_standard_args> command which automatically prints the find result message based on whether the package was found:

FindFoo.cmake

```
# ...
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(

  Foo

  REQUIRED_VARS Foo_LIBRARY Foo_INCLUDE_DIR
)
```

### FortranCInterface
This module provides variables and commands to detect Fortran/C Interface.

Load this module in a CMake project with:

```
include(FortranCInterface)
```

This module automatically detects the API by which C and Fortran languages interact.

### Result Variables
Including this module defines the following variables that indicate if the mangling is found:

FortranCInterface_GLOBAL_FOUND

Boolean indicating whether global subroutines and functions are available.

FortranCInterface_MODULE_FOUND

Boolean indicating whether module subroutines and functions (declared by MODULE PROCEDURE) are available.

### Input Variables
This module also provides the following variables to specify the detected mangling, though a typical use case does not need to reference them and can use the Commands below.

FortranCInterface_GLOBAL_PREFIX

Prefix for a global symbol without an underscore.

FortranCInterface_GLOBAL_SUFFIX

Suffix for a global symbol without an underscore.

FortranCInterface_GLOBAL_CASE

The case for a global symbol without an underscore, either UPPER or LOWER.

FortranCInterface_GLOBAL__PREFIX

Prefix for a global symbol with an underscore.

FortranCInterface_GLOBAL__SUFFIX

Suffix for a global symbol with an underscore.

FortranCInterface_GLOBAL__CASE

The case for a global symbol with an underscore, either UPPER or LOWER.

FortranCInterface_MODULE_PREFIX

Prefix for a module symbol without an underscore.

FortranCInterface_MODULE_MIDDLE

Middle of a module symbol without an underscore that appears between the name of the module and the name of the symbol.

FortranCInterface_MODULE_SUFFIX

Suffix for a module symbol without an underscore.

FortranCInterface_MODULE_CASE

The case for a module symbol without an underscore, either UPPER or LOWER.

FortranCInterface_MODULE_ORDER

Added in version 4.1.

Order of components for module symbols without an underscore:

MODULE_THEN_SYMBOL

The module name appears before the symbol name, i.e., <PREFIX><module><MIDDLE><symbol><SUFFIX>.

SYMBOL_THEN_MODULE

The module name appears after the symbol name, i.e., <PREFIX><symbol><MIDDLE><module><SUFFIX>.

FortranCInterface_MODULE__PREFIX

Prefix for a module symbol with an underscore.

FortranCInterface_MODULE__MIDDLE

Middle of a module symbol with an underscore that appears between the name of the module and the name of the symbol.

FortranCInterface_MODULE__SUFFIX

Suffix for a module symbol with an underscore.

FortranCInterface_MODULE__CASE

The case for a module symbol with an underscore, either UPPER or LOWER.

FortranCInterface_MODULE__ORDER

Added in version 4.1.

Order of components for module symbols with an underscore:

MODULE_THEN_SYMBOL

The module name appears before the symbol name, i.e., <PREFIX><module><MIDDLE><symbol><SUFFIX>.

SYMBOL_THEN_MODULE

The module name appears after the symbol name, i.e., <PREFIX><symbol><MIDDLE><module><SUFFIX>.

### Variables For Additional Manglings
This module is aware of possible GLOBAL and MODULE manglings for many Fortran compilers, but it also provides an interface to specify new possible manglings. The following variables can be set before including this module to specify additional manglings:

FortranCInterface_GLOBAL_SYMBOLS

FortranCInterface_MODULE_SYMBOLS

before including this module to specify manglings of the symbols MySub, My_Sub, MyModule:MySub, and My_Module:My_Sub.

### Commands
This module provides the following commands:

FortranCInterface_HEADER

Generates a C header file containing macros to mangle symbol names:

```
FortranCInterface_HEADER(

  <file>

  [MACRO_NAMESPACE <macro-ns>]

  [SYMBOL_NAMESPACE <ns>]

  [SYMBOLS [<module>:]<function> ...]
)
```

This command generates a <file> with definitions of the following macros:

```
#define FortranCInterface_GLOBAL (name,NAME) ...
#define FortranCInterface_GLOBAL_(name,NAME) ...
#define FortranCInterface_MODULE (mod,name, MOD,NAME) ...
#define FortranCInterface_MODULE_(mod,name, MOD,NAME) ...
```

These macros mangle four categories of Fortran symbols, respectively:

- Global symbols without '_': call mysub()

- Global symbols with '_' : call my_sub()

- Module symbols without '_': use mymod; call mysub()

- Module symbols with '_' : use mymod; call my_sub()

If mangling for a category is not known, its macro is left undefined. All macros require raw names in both lower case and upper case.

The options are:

MACRO_NAMESPACE

Replace the default FortranCInterface_ prefix with a given namespace <macro-ns>.

SYMBOL_NAMESPACE

Prefix all preprocessor definitions generated by the SYMBOLS option with a given namespace <ns>.

SYMBOLS

List symbols to mangle automatically with C preprocessor definitions:

```
<function>          ==> #define <ns><function> ...
<module>:<function> ==> #define <ns><module>_<function> ...
```

If the mangling for some symbol is not known then no preprocessor definition is created, and a warning is displayed.

FortranCInterface_VERIFY

Verifies that the Fortran and C/C++ compilers work together:

```
FortranCInterface_VERIFY([CXX] [QUIET])
```

This command tests whether a simple test executable using Fortran and C (and C++ when the CXX option is given) compiles and links successfully. The result is stored in the cache entry FortranCInterface_VERIFIED_C (or FortranCInterface_VERIFIED_CXX if CXX is given) as a boolean. If the check fails and QUIET is not given the command terminates with a fatal error message describing the problem. The purpose of this check is to stop a build early for incompatible compiler combinations. The test is built in the Release configuration.

### Examples: Basic Usage
The following example creates a FC.h header that defines mangling macros FC_GLOBAL(), FC_GLOBAL_(), FC_MODULE(), and FC_MODULE_():

```
include(FortranCInterface)
FortranCInterface_HEADER(FC.h MACRO_NAMESPACE "FC_")
```

The next example creates a FCMangle.h header that defines the same FC_*() mangling macros as the previous example plus preprocessor symbols FC_mysub and FC_mymod_my_sub:

```
include(FortranCInterface)
FortranCInterface_HEADER(

  FCMangle.h

  MACRO_NAMESPACE "FC_"

  SYMBOL_NAMESPACE "FC_"

  SYMBOLS mysub mymod:my_sub
)
```

### Example: Additional Manglings
The following example shows how to specify manglings of the symbols MySub, My_Sub, MyModule:MySub, and My_Module:My_Sub. The following code tells this module to try given GLOBAL and MODULE manglings. (The carets point at raw symbol names for clarity in this example but are not needed.)

```
set(FortranCInterface_GLOBAL_SYMBOLS mysub_ my_sub__ MYSUB_)

  #                                  ^^^^^  ^^^^^^   ^^^^^
set(FortranCInterface_MODULE_SYMBOLS

    __mymodule_MOD_mysub __my_module_MOD_my_sub)

  #   ^^^^^^^^     ^^^^^   ^^^^^^^^^     ^^^^^^
include(FortranCInterface)
# ...
```

### GenerateExportHeader
This module provides commands for generating a header file containing preprocessor macro definitions to control C/C++ symbol visibility.

Load this module in a CMake project with:

```
include(GenerateExportHeader)
```

Added in version 3.12: Support for C projects. Previous versions supported C++ projects only.

When developing C or C++ projects, especially for cross-platform use, symbol visibility determines which functions, classes, global variables, templates, and other symbols are made visible to users of the library.

For example, on Windows, symbols must be explicitly marked with __declspec(dllexport) when building a shared library, and __declspec(dllimport) when using it. Other platforms may use attributes like __attribute__((visibility("default"))).

This module simplifies the creation and usage of preprocessor macros to manage these requirements, avoiding repetitive and error-prone #ifdef blocks in source code.

Some symbol visibility can also be controlled with compiler options. In CMake, target properties such as <LANG>_VISIBILITY_PRESET <#prop_tgt:<LANG>_VISIBILITY_PRESET> and VISIBILITY_INLINES_HIDDEN <#prop_tgt:VISIBILITY_INLINES_HIDDEN> enable compiler visibility flags, where appropriate. See also related convenience variables CMAKE_<LANG>_VISIBILITY_PRESET <#variable:CMAKE_<LANG>_VISIBILITY_PRESET> and CMAKE_VISIBILITY_INLINES_HIDDEN <#variable:CMAKE_VISIBILITY_INLINES_HIDDEN> to enable it for all targets in current scope. These are commonly used in combination with this module to further simplify C/C++ code, removing the need for some of the preprocessor macros in the source code.

### Commands
This module provides the following commands:

### Generating Export Header
generate_export_header

Generates a header file suitable for inclusion in source code, containing preprocessor export macros for controlling the visibility of symbols:

```
generate_export_header(

  <target>

  [BASE_NAME <base-name>]

  [EXPORT_FILE_NAME <export-file-name>]

  [EXPORT_MACRO_NAME <export-macro-name>]

  [NO_EXPORT_MACRO_NAME <no-export-macro-name>]

  [DEPRECATED_MACRO_NAME <deprecated-macro-name>]

  [DEFINE_NO_DEPRECATED]

  [NO_DEPRECATED_MACRO_NAME <no-deprecated-macro-name>]

  [STATIC_DEFINE <static-define>]

  [PREFIX_NAME <prefix>]

  [CUSTOM_CONTENT_FROM_VARIABLE <variable>]

  [INCLUDE_GUARD_NAME <include-guard-name>]
)
```

By default, this command generates a header file named <target-name-lowercase>_export.h in the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>). This header defines a set of preprocessor macros used to mark API symbols as exported, hidden, or deprecated across different platforms and build types (e.g., static or shared builds), and is intended to be installed along with the library's public headers, because it affects public API declarations:

- <MACRO>_EXPORT: Marks symbols for export or import, making them visible as part of the public API when building or consuming a shared library.

- <MACRO>_NO_EXPORT: Marks symbols that should not be exported. If the <LANG>_VISIBILITY_PRESET <#prop_tgt:<LANG>_VISIBILITY_PRESET> target property is set to hidden, using this macro in source code is typically redundant.

- <MACRO>_DEPRECATED: Marks symbols as deprecated. When such symbols are used, the compiler emits a warning at compile-time.

- <MACRO>_DEPRECATED_EXPORT: Combines export/import and deprecation markers for a symbol that is both part of the public API and deprecated.

- <MACRO>_DEPRECATED_NO_EXPORT: Marks a deprecated symbol that should not be exported (internal and deprecated).

- <MACRO>_NO_DEPRECATED: A macro that can be used in source code to conditionally exclude deprecated code parts from the build via preprocessor logic.

The <MACRO> part is derived by default from the uppercase name of the target or the explicitly provided <base-name>. All macro names can be customized using the optional arguments.

The arguments are:

<target>

Name of a target for which the export header will be generated. Supported target types:

- STATIC library (in this case, export-related macros are defined without values)

- SHARED library

- MODULE library

- Added in version 3.1: OBJECT library

BASE_NAME <base-name>

If specified, it overrides the default file name and macro names.

EXPORT_FILE_NAME <export-file-name>

If specified, it overrides the full path and the name of the generated export header file (<base-name-lowercase>_export.h) to <export-file-name>. If given as a relative path, it will be interpreted relative to the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>).

EXPORT_MACRO_NAME <export-macro-name>

If specified, it overrides the default macro name for the export directive.

NO_EXPORT_MACRO_NAME <no-export-macro-name>

If specified, the <no-export-macro-name> will be used for the macro name that designates the attribute for items that shouldn't be exported.

DEPRECATED_MACRO_NAME <deprecated-macro-name>

If specified, the following names will be used:

- <deprecated-macro-name> (macro for marking deprecated symbols)

- <deprecated-macro-name>_EXPORT (macro for deprecated symbols with export markers)

- <deprecated-macro-name>_NO_EXPORT (macro for deprecated symbols with no-export markers)

instead of the default names in format of <MACRO>_DEPRECATED{,_EXPORT,_NO_EXPORT}.

DEFINE_NO_DEPRECATED

If specified, this will define a macro named <MACRO>_NO_DEPRECATED.

NO_DEPRECATED_MACRO_NAME <no-deprecated-macro-name>

Used in combination with DEFINE_NO_DEPRECATED option. If specified, then a macro named <no-deprecated-macro-name> is used instead of the default <MACRO>_NO_DEPRECATED.

STATIC_DEFINE <static-define>

If specified, the <static-define> macro name will be used instead of the default <MACRO>_STATIC_DEFINE. This macro controls the symbol export behavior in the generated header for static libraries. It is typically used when building both shared and static variants of a library from the same sources using a single generated export header. When this macro is defined for static library, the export-related macros will expand to nothing. This is important also on Windows, where symbol decoration is required only for shared libraries, not for static ones.

PREFIX_NAME <prefix>

If specified, the additional <prefix> is prepended to all generated macro names.

CUSTOM_CONTENT_FROM_VARIABLE <variable>

Added in version 3.7.

If specified, the content from the <variable> value is appended to the generated header file content after the preprocessor macros definitions.

INCLUDE_GUARD_NAME <include-guard-name>

Added in version 3.11.

If specified, the <include-guard-name> is used as the preprocessor macro name to guard multiple inclusions of the generated header instead of the default name <export-macro-name>_H.

<base-name-lowercase>_export.h

```
#ifndef <include-guard-name>
#define <include-guard-name>
// ...
#endif /* <include-guard-name> */
```

### Deprecated Command
add_compiler_export_flags

Deprecated since version 3.0: Set the target properties CXX_VISIBILITY_PRESET <#prop_tgt:<LANG>_VISIBILITY_PRESET> and VISIBILITY_INLINES_HIDDEN <#prop_tgt:VISIBILITY_INLINES_HIDDEN> instead.

Adds C++ compiler options -fvisibility=hidden (and -fvisibility-inlines-hidden, if supported) to hide all symbols by default to either CMAKE_CXX_FLAGS <#variable:CMAKE_<LANG>_FLAGS> variable or to a specified variable:

```
add_compiler_export_flags([<output_variable>])
```

This command is a no-op on Windows which does not need extra compiler flags for exporting support.

<output-variable>

Optional variable name that will be populated with a string of space-separated C++ compile options required to enable visibility support for the compiler/architecture in use. If this argument is specified, the CMAKE_CXX_FLAGS <#variable:CMAKE_<LANG>_FLAGS> variable will not be modified.

### Example: Generating Export Header
The following example demonstrates how to use this module to generate an export header in the current binary directory (example_export.h) and use it in a C++ library named example to control symbols visibility. The generated header defines the preprocessor macros EXAMPLE_EXPORT, EXAMPLE_NO_EXPORT, EXAMPLE_DEPRECATED, EXAMPLE_DEPRECATED_EXPORT, and EXAMPLE_DEPRECATED_NO_EXPORT, and is installed along with the library's other public headers:

CMakeLists.txt

```
cmake_minimum_required(VERSION 3.24)
project(GenerateExportHeaderExample)
# Set default visibility of all symbols to hidden
set(CMAKE_CXX_VISIBILITY_PRESET "hidden")
set(CMAKE_VISIBILITY_INLINES_HIDDEN TRUE)
add_library(example)
include(GenerateExportHeader)
generate_export_header(example)
target_sources(

  example

  PRIVATE example.cxx

  PUBLIC

    FILE_SET HEADERS

      FILES example.h

    FILE_SET generated_headers

      TYPE HEADERS

      BASE_DIRS ${CMAKE_CURRENT_BINARY_DIR}

      FILES ${CMAKE_CURRENT_BINARY_DIR}/example_export.h
)
install(

  TARGETS example

  FILE_SET HEADERS

  FILE_SET generated_headers
)
```

And in the ABI header files:

example.h

```
#include "example_export.h"
// This class is part of the public API and is exported
class EXAMPLE_EXPORT SomeClass
{
public:

  SomeClass();

  void doSomething();

  // This method is deprecated

  EXAMPLE_DEPRECATED void legacyMethod();
};
// This function is exported and deprecated
EXAMPLE_DEPRECATED_EXPORT void legacyPublicFunction();
// This function is deprecated but not exported
EXAMPLE_DEPRECATED void legacyInternalFunction();
```

example.cxx

```
#include <iostream>
#include "example.h"
SomeClass::SomeClass() = default;
void SomeClass::doSomething()
{

  std::cout << "SomeClass::doSomething() called" << std::endl;
}
void SomeClass::legacyMethod()
{

  std::cout << "SomeClass::legacyMethod() is deprecated" << std::endl;
}
void legacyPublicFunction()
{

  std::cout << "legacyPublicFunction() is deprecated" << std::endl;
}
void internalLegacyFunction()
{

  std::cout << "legacyInternalFunction() is deprecated" << std::endl;
}
```

### Examples: Customizing Generated Header
The BASE_NAME argument can be used to override the generated file name and the names used for the macros. The following will generate a file named other_name_export.h containing export-related macros such as OTHER_NAME_EXPORT, OTHER_NAME_NO_EXPORT, OTHER_NAME_DEPRECATED, etc.

```
add_library(example example.cxx)
include(GenerateExportHeader)
generate_export_header(example BASE_NAME "other_name")
```

The BASE_NAME may be overridden by specifying other command options. For example, the following creates a macro OTHER_NAME_EXPORT instead of EXAMPLE_EXPORT, but other macros and the generated header file name are set to their default values:

```
add_library(example example.cxx)
include(GenerateExportHeader)
generate_export_header(example EXPORT_MACRO_NAME "OTHER_NAME_EXPORT")
```

The following example creates KDE_DEPRECATED macro instead of default EXAMPLE_DEPRECATED:

```
add_library(example example.cxx)
include(GenerateExportHeader)
generate_export_header(example DEPRECATED_MACRO_NAME "KDE_DEPRECATED")
```

The DEFINE_NO_DEPRECATED option can be used to define a macro which can be used to remove deprecated code from preprocessor output:

```
option(EXCLUDE_DEPRECATED "Exclude deprecated parts of the library")
if(EXCLUDE_DEPRECATED)

  set(NO_BUILD_DEPRECATED DEFINE_NO_DEPRECATED)
endif()
include(GenerateExportHeader)
generate_export_header(example ${NO_BUILD_DEPRECATED})
```

example.h

```
class EXAMPLE_EXPORT SomeClass
{
public:
#ifndef EXAMPLE_NO_DEPRECATED

  EXAMPLE_DEPRECATED void legacyMethod();
#endif
};
```

example.cxx

```
#ifndef EXAMPLE_NO_DEPRECATED
void SomeClass::legacyMethod() {  }
#endif
```

The PREFIX_NAME argument can be used to prepend all generated macro names with some prefix. For example, the following will generate macros such as VTK_SOMELIB_EXPORT, etc.

```
include(GenerateExportHeader)
generate_export_header(somelib PREFIX_NAME "VTK_")
```

Appending additional content to generated header can be done with the CUSTOM_CONTENT_FROM_VARIABLE argument:

```
include(GenerateExportHeader)
set(content [[#include "project_api.h"]])
generate_export_header(example CUSTOM_CONTENT_FROM_VARIABLE content)
```

### Example: Building Shared and Static Library
In the following example both a shared and a static library are built from the same sources, and the <MACRO>_STATIC_DEFINE macro compile definition is defined to ensure the same generated export header works for both:

```
add_library(example_shared SHARED example.cxx)
add_library(example_static STATIC example.cxx)
include(GenerateExportHeader)
generate_export_header(example_shared BASE_NAME "example")
# Define macro to disable export attributes for static build
target_compile_definitions(example_static PRIVATE EXAMPLE_STATIC_DEFINE)
```

### Example: Upgrading Deprecated Command
In earlier versions of CMake, add_compiler_export_flags() command was used to add symbol visibility compile options:

CMakeLists.txt

```
add_library(example example.cxx)
include(GenerateExportHeader)
add_compiler_export_flags(flags)
string(REPLACE " " ";" flags "${flags}")
set_property(TARGET example APPEND PROPERTY COMPILE_OPTIONS "${flags}")
generate_export_header(example)
```

In new code, the following target properties are used to achieve the same functionality:

CMakeLists.txt

```
add_library(example example.cxx)
include(GenerateExportHeader)
set_target_properties(

  example

  PROPERTIES

    CXX_VISIBILITY_PRESET hidden

    VISIBILITY_INLINES_HIDDEN TRUE
)
generate_export_header(example)
```

### See Also

- The DEFINE_SYMBOL <#prop_tgt:DEFINE_SYMBOL> target property to customize the preprocessor macro name used by the generated header. This macro determines whether the library header is being included during the library's own compilation or when it is used by another project (e.g., after installation).

- The ENABLE_EXPORTS <#prop_tgt:ENABLE_EXPORTS> target property.

- The WINDOWS_EXPORT_ALL_SYMBOLS <#prop_tgt:WINDOWS_EXPORT_ALL_SYMBOLS> target property.

### GNUInstallDirs
This module defines the installation directory variables according to the GNU Coding Standards <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html> and provides a command to compute installation-related absolute paths.

Load this module in a CMake project with:

```
include(GNUInstallDirs)
```

### Result Variables
Inclusion of this module defines the following variables:

CMAKE_INSTALL_<dir>

Destination for files of a given type. This value may be passed to the DESTINATION options of install() <#command:install> commands for the corresponding file type. It should be a path relative to the installation prefix so that it can be converted to an absolute path in a relocatable way. However, there are some special cases as documented below. While absolute paths are allowed, they are not recommended as they do not work with the cmake --install command's --prefix <#cmdoption-cmake--install-0> option, or with the cpack <#manual:cpack(1)> installer generators. In particular, there is no need to make paths absolute by prepending CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX>; this prefix is used by default if the DESTINATION is a relative path.

CMAKE_INSTALL_FULL_<dir>

The absolute path generated from the corresponding CMAKE_INSTALL_<dir> value. If the value is not already an absolute path, an absolute path is constructed typically by prepending the value of the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> variable, except in special cases as documented below. These variables shouldn't be used in install() <#command:install> commands as they do not work with the cmake --install command's --prefix <#cmdoption-cmake--install-0> option, or with the cpack <#manual:cpack(1)> installer generators.

where <dir> is one of:

BINDIR

user executables (bin)

SBINDIR

system admin executables (sbin)

LIBEXECDIR

program executables (libexec)

SYSCONFDIR

read-only single-machine data (etc) Changed in version 4.1: If the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> falls into the special cases, the default paths for are the absolute path variants as described there. See policy CMP0192 <#policy:CMP0192>.

SHAREDSTATEDIR

modifiable architecture-independent data (com)

LOCALSTATEDIR

modifiable single-machine data (var) Changed in version 4.1: If the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> falls into the special cases, the default paths for are the absolute path variants as described there. See policy CMP0192 <#policy:CMP0192>.

RUNSTATEDIR

run-time variable data (LOCALSTATEDIR/run) Added in version 3.9.

Changed in version 4.1: If the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> falls into the special cases, the default paths for are the absolute path variants as described there. See policy CMP0192 <#policy:CMP0192>.

LIBDIR

object code libraries (lib or lib64) On Debian, this may be lib/<multiarch-tuple> when CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> is /usr.

Note:

When an alternative installation prefix is specified with the --prefix <#cmdoption-cmake--install-0> option at install time, the special case with multi-architecture tuple is evaluated based on the configuration-time CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX>, not on the alternative prefix value.

INCLUDEDIR

C header files (include)

OLDINCLUDEDIR

C header files for non-gcc (/usr/include)

DATAROOTDIR

read-only architecture-independent data root (share)

DATADIR

read-only architecture-independent data (DATAROOTDIR) The DATADIR and DATAROOTDIR are treated separately so that DATADIR can be customized for project-specific data files, while DATAROOTDIR remains unchanged for standard architecture-independent locations INFODIR, LOCALEDIR, MANDIR, and DOCDIR.

INFODIR

info documentation (DATAROOTDIR/info)

LOCALEDIR

locale-dependent data (DATAROOTDIR/locale)

MANDIR

man documentation (DATAROOTDIR/man)

DOCDIR

documentation root (DATAROOTDIR/doc/PROJECT_NAME)

If the includer does not define a value the above-shown default will be used and the value will appear in the cache for editing by the user.

If a default value for the CMAKE_INSTALL_<dir> is used and the CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> is changed, the new default value will be used calculated on the new CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> value. Using --prefix <#cmdoption-cmake--install-0> in cmake --install will not alter these values.

### Special Cases
Added in version 3.4.

The following values of CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> are special:

/

For <dir> other than the SYSCONFDIR, LOCALSTATEDIR and RUNSTATEDIR, the value of CMAKE_INSTALL_<dir> is prefixed with usr/ if it is not user-specified as an absolute path. For example, the INCLUDEDIR value include becomes usr/include. This is required by the GNU Coding Standards <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html>, which state: When building the complete GNU system, the prefix will be empty and /usr will be a symbolic link to /.

Changed in version 4.1: The CMAKE_INSTALL_<dir> variables are cached with the usr/ prefix. See policy CMP0193 <#policy:CMP0193>.

/usr

For <dir> equal to SYSCONFDIR, LOCALSTATEDIR or RUNSTATEDIR, the CMAKE_INSTALL_FULL_<dir> is computed by prepending just / to the value of CMAKE_INSTALL_<dir> if it is not already an absolute path. For example, the SYSCONFDIR value etc becomes /etc. This is required by the GNU Coding Standards <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html>. Changed in version 4.1: The default values of CMAKE_INSTALL_<dir> for <dir> equal to SYSCONFDIR, LOCALSTATEDIR and RUNSTATEDIR are the absolute paths /etc, /var and /var/run respectively. See policy CMP0192 <#policy:CMP0192>.

/opt/...

For <dir> equal to SYSCONFDIR, LOCALSTATEDIR or RUNSTATEDIR, the CMAKE_INSTALL_FULL_<dir> is computed by appending the prefix to the value of CMAKE_INSTALL_<dir> if it is not already an absolute path. For example, the SYSCONFDIR value etc becomes /etc/opt/.... This is defined by the Filesystem Hierarchy Standard <https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html>. This behavior does not apply to paths under /opt/homebrew/....

Changed in version 4.1: The default values of CMAKE_INSTALL_<dir> for <dir> equal to SYSCONFDIR, LOCALSTATEDIR and RUNSTATEDIR are the absolute paths /etc/opt/..., /var/opt/... and /var/run/opt/... respectively. See policy CMP0192 <#policy:CMP0192>.

Note:

When an alternative installation prefix is specified with the --prefix <#cmdoption-cmake--install-0> option at install time, these special cases are evaluated based on the configuration-time CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX>, not on the alternative prefix value.

### Commands
This module provides the following command:

GNUInstallDirs_get_absolute_install_dir

Added in version 3.7.

Computes an absolute installation path from a given relative path:

```
GNUInstallDirs_get_absolute_install_dir(<result-var> <input-var> <dir>)
```

This command takes the value from the variable <input-var> and computes its absolute path according to GNU standard installation directories. If the input path is relative, it is prepended with CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> and may be adjusted for the special cases described above.

The arguments are:

<result-var>

Name of the variable in which to store the computed absolute path.

<input-var>

Name of the variable containing the path that will be used to compute its associated absolute installation path. Changed in version 4.1: This variable is no longer altered. See policy CMP0193 <#policy:CMP0193>. In previous CMake versions, this command modified the <input-var> variable value based on the special cases.

<dir>

Added in version 3.20.

The directory type name, e.g., SYSCONFDIR, LOCALSTATEDIR, RUNSTATEDIR, etc. This argument determines whether special cases apply when computing the absolute path.

Changed in version 3.20: Before the <dir> argument was introduced, the directory type could be specified by setting the dir variable prior to calling this command. As of CMake 3.20, if the <dir> argument is provided explicitly, the dir variable is ignored.

While this command is used internally by this module to compute the CMAKE_INSTALL_FULL_<dir> variables, it is also exposed publicly for users to create additional custom installation path variables and compute absolute paths where necessary, using the same logic.

### See Also
•

The install() <#command:install> command.

### GoogleTest
Added in version 3.9.

This module provides commands to help use the Google Test infrastructure.

Load this module in a CMake project with:

```
include(GoogleTest)
```

Two mechanisms for adding tests are provided. gtest_add_tests() has been around for some time, originally via find_package(GTest). gtest_discover_tests() was introduced in CMake 3.10.

The (older) gtest_add_tests() scans source files to identify tests. This is usually effective, with some caveats, including in cross-compiling environments, and makes setting additional properties on tests more convenient. However, its handling of parameterized tests is less comprehensive, and it requires re-running CMake to detect changes to the list of tests.

The (newer) gtest_discover_tests() discovers tests by asking the compiled test executable to enumerate its tests. This is more robust and provides better handling of parameterized tests, and does not require CMake to be re-run when tests change. However, it may not work in a cross-compiling environment, and setting test properties is less convenient.

More details can be found in the documentation of the respective functions.

Both commands are intended to replace use of add_test() <#command:add_test> to register tests, and will create a separate CTest test for each Google Test test case. Note that this is in some cases less efficient, as common set-up and tear-down logic cannot be shared by multiple test cases executing in the same instance. However, it provides more fine-grained pass/fail information to CTest, which is usually considered as more beneficial. By default, the CTest test name is the same as the Google Test name (i.e. suite.testcase); see also TEST_PREFIX and TEST_SUFFIX.

gtest_add_tests

Automatically add tests with CTest by scanning source code for Google Test macros:

```
gtest_add_tests(TARGET target

                [SOURCES src1...]

                [EXTRA_ARGS args...]

                [WORKING_DIRECTORY dir]

                [TEST_PREFIX prefix]

                [TEST_SUFFIX suffix]

                [SKIP_DEPENDENCY]

                [TEST_LIST outVar]
)
```

gtest_add_tests attempts to identify tests by scanning source files. Although this is generally effective, it uses only a basic regular expression match, which can be defeated by atypical test declarations, and is unable to fully "split" parameterized tests. Additionally, it requires that CMake be re-run to discover any newly added, removed or renamed tests (by default, this means that CMake is re-run when any test source file is changed, but see SKIP_DEPENDENCY). However, it has the advantage of declaring tests at CMake time, which somewhat simplifies setting additional properties on tests, and always works in a cross-compiling environment.

The options are:

TARGET target

Specifies the Google Test executable, which must be a known CMake executable target. CMake will substitute the location of the built executable when running the test.

SOURCES src1...

When provided, only the listed files will be scanned for test cases. If this option is not given, the SOURCES <#prop_tgt:SOURCES> property of the specified target will be used to obtain the list of sources.

EXTRA_ARGS args...

Any extra arguments to pass on the command line to each test case. Changed in version 3.31: Empty values in args... are preserved, see CMP0178 <#policy:CMP0178>.

WORKING_DIRECTORY dir

Specifies the directory in which to run the discovered test cases. If this option is not provided, the current binary directory is used.

TEST_PREFIX prefix

Specifies a prefix to be prepended to the name of each discovered test case. This can be useful when the same source files are being used in multiple calls to gtest_add_test() but with different EXTRA_ARGS.

TEST_SUFFIX suffix

Similar to TEST_PREFIX except the suffix is appended to the name of every discovered test case. Both TEST_PREFIX and TEST_SUFFIX may be specified.

SKIP_DEPENDENCY

Normally, the function creates a dependency which will cause CMake to be re-run if any of the sources being scanned are changed. This is to ensure that the list of discovered tests is updated. If this behavior is not desired (as may be the case while actually writing the test cases), this option can be used to prevent the dependency from being added.

TEST_LIST outVar

The variable named by outVar will be populated in the calling scope with the list of discovered test cases. This allows the caller to do things like manipulate test properties of the discovered tests.

Changed in version 3.31: Empty values in the TEST_LAUNCHER <#prop_tgt:TEST_LAUNCHER> and CROSSCOMPILING_EMULATOR <#prop_tgt:CROSSCOMPILING_EMULATOR> target properties are preserved, see policy CMP0178 <#policy:CMP0178>.

Usage example:

```
include(GoogleTest)
add_executable(FooTest FooUnitTest.cxx)
gtest_add_tests(TARGET      FooTest

                TEST_SUFFIX .noArgs

                TEST_LIST   noArgsTests
)
gtest_add_tests(TARGET      FooTest

                EXTRA_ARGS  --someArg someValue

                TEST_SUFFIX .withArgs

                TEST_LIST   withArgsTests
)
set_tests_properties(${noArgsTests}   PROPERTIES TIMEOUT 10)
set_tests_properties(${withArgsTests} PROPERTIES TIMEOUT 20)
```

For backward compatibility, the following form is also supported:

```
gtest_add_tests(exe args files...)
```

exe

The path to the test executable or the name of a CMake target.

args

A semicolon-separated list of extra arguments to be passed to executable. The entire list must be passed as a single argument. Enclose it in quotes, or pass "" for no arguments.

files...

A list of source files to search for tests and test fixtures. Alternatively, use AUTO to specify that exe is the name of a CMake executable target whose sources should be scanned.

```
include(GoogleTest)
set(FooTestArgs --foo 1 --bar 2)
add_executable(FooTest FooUnitTest.cxx)
gtest_add_tests(FooTest "${FooTestArgs}" AUTO)
```

gtest_discover_tests

Automatically add tests with CTest by querying the compiled test executable for available tests:

```
gtest_discover_tests(target

                     [EXTRA_ARGS args...]

                     [WORKING_DIRECTORY dir]

                     [TEST_PREFIX prefix]

                     [TEST_SUFFIX suffix]

                     [TEST_FILTER expr]

                     [NO_PRETTY_TYPES] [NO_PRETTY_VALUES]

                     [PROPERTIES name1 value1...]

                     [TEST_LIST var]

                     [DISCOVERY_TIMEOUT seconds]

                     [XML_OUTPUT_DIR dir]

                     [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]

                     [DISCOVERY_EXTRA_ARGS args...]
)
```

Added in version 3.10.

gtest_discover_tests() sets up a post-build or pre-test command on the test executable that generates the list of tests by parsing the output from running the test executable with the --gtest_list_tests argument. Compared to the source parsing approach of gtest_add_tests(), this ensures that the full list of tests, including instantiations of parameterized tests, is obtained. Since test discovery occurs at build or test time, it is not necessary to re-run CMake when the list of tests changes. However, it requires that CROSSCOMPILING_EMULATOR <#prop_tgt:CROSSCOMPILING_EMULATOR> is properly set in order to function in a cross-compiling environment.

Additionally, setting properties on tests is somewhat less convenient, since the tests are not available at CMake time. Additional test properties may be assigned to the set of tests as a whole using the PROPERTIES option. If more fine-grained test control is needed, custom content may be provided through an external CTest script using the TEST_INCLUDE_FILES <#prop_dir:TEST_INCLUDE_FILES> directory property. The set of discovered tests is made accessible to such a script via the <target>_TESTS variable (see the TEST_LIST option below for further discussion and limitations).

The options are:

target

Specifies the Google Test executable, which must be a known CMake executable target. CMake will substitute the location of the built executable when running the test.

EXTRA_ARGS args...

Any extra arguments to pass on the command line to each test case. Changed in version 3.31: Empty values in args... are preserved, see CMP0178 <#policy:CMP0178>.

WORKING_DIRECTORY dir

Specifies the directory in which to run the discovered test cases. If this option is not provided, the current binary directory is used.

TEST_PREFIX prefix

Specifies a prefix to be prepended to the name of each discovered test case. This can be useful when the same test executable is being used in multiple calls to gtest_discover_tests() but with different EXTRA_ARGS.

TEST_SUFFIX suffix

Similar to TEST_PREFIX except the suffix is appended to the name of every discovered test case. Both TEST_PREFIX and TEST_SUFFIX may be specified.

TEST_FILTER expr

Added in version 3.22.

Filter expression to pass as a --gtest_filter argument during test discovery. Note that the expression is a wildcard-based format that matches against the original test names as used by gtest. For type or value-parameterized tests, these names may be different to the potentially pretty-printed test names that ctest uses.

NO_PRETTY_TYPES

By default, the type index of type-parameterized tests is replaced by the actual type name in the CTest test name. If this behavior is undesirable (e.g. because the type names are unwieldy), this option will suppress this behavior.

NO_PRETTY_VALUES

By default, the value index of value-parameterized tests is replaced by the actual value in the CTest test name. If this behavior is undesirable (e.g. because the value strings are unwieldy), this option will suppress this behavior.

PROPERTIES name1 value1...

Specifies additional properties to be set on all tests discovered by this invocation of gtest_discover_tests().

TEST_LIST var

Make the list of tests available in the variable var, rather than the default <target>_TESTS. This can be useful when the same test executable is being used in multiple calls to gtest_discover_tests(). Note that this variable is only available in CTest. Due to a limitation of CMake's parsing rules, any test with a square bracket in its name will be omitted from the list of tests stored in this variable. Such tests will still be defined and executed by ctest as normal though.

DISCOVERY_TIMEOUT num

Added in version 3.10.3.

Specifies how long (in seconds) CMake will wait for the test to enumerate available tests. If the test takes longer than this, discovery (and your build) will fail. Most test executables will enumerate their tests very quickly, but under some exceptional circumstances, a test may require a longer timeout. The default is 5. See also the TIMEOUT option of execute_process() <#command:execute_process>.

Note:

In CMake versions 3.10.1 and 3.10.2, this option was called TIMEOUT. This clashed with the TIMEOUT test property, which is one of the common properties that would be set with the PROPERTIES keyword, usually leading to legal but unintended behavior. The keyword was changed to DISCOVERY_TIMEOUT in CMake 3.10.3 to address this problem. The ambiguous behavior of the TIMEOUT keyword in 3.10.1 and 3.10.2 has not been preserved.

XML_OUTPUT_DIR dir

Added in version 3.18.

If specified, the parameter is passed along with --gtest_output=xml: to test executable. The actual file name is the same as the test target, including prefix and suffix. This should be used instead of EXTRA_ARGS --gtest_output=xml to avoid race conditions writing the XML result output when using parallel test execution.

DISCOVERY_MODE

Added in version 3.18.

Provides greater control over when gtest_discover_tests() performs test discovery. By default, POST_BUILD sets up a post-build command to perform test discovery at build time. In certain scenarios, like cross-compiling, this POST_BUILD behavior is not desirable. By contrast, PRE_TEST delays test discovery until just prior to test execution. This way test discovery occurs in the target environment where the test has a better chance at finding appropriate runtime dependencies.

DISCOVERY_MODE defaults to the value of the CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE variable if it is not passed when calling gtest_discover_tests(). This provides a mechanism for globally selecting a preferred test discovery behavior without having to modify each call site.

DISCOVERY_EXTRA_ARGS args...

Added in version 3.31.

Any extra arguments to pass on the command line for the discovery command.

Added in version 3.29: The TEST_LAUNCHER <#prop_tgt:TEST_LAUNCHER> target property is honored during test discovery and test execution.

Changed in version 3.31: Empty values in the TEST_LAUNCHER <#prop_tgt:TEST_LAUNCHER> and CROSSCOMPILING_EMULATOR <#prop_tgt:CROSSCOMPILING_EMULATOR> target properties are preserved, see policy CMP0178 <#policy:CMP0178>.

### InstallRequiredSystemLibraries
This module searches for compiler-provided system runtime libraries and adds installation rules for them.

Load this module in a CMake project with:

```
include(InstallRequiredSystemLibraries)
```

Some optional variables may be set prior to including this module to adjust behavior:

CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS

Specify additional runtime libraries that may not be detected. After inclusion any detected libraries will be appended to this.

CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_SKIP

Set to TRUE to skip calling the install(PROGRAMS) <#programs> command to allow the includer to specify its own install rule, using the value of CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS to get the list of libraries.

CMAKE_INSTALL_DEBUG_LIBRARIES

Set to TRUE to install the debug runtime libraries when available with MSVC tools.

CMAKE_INSTALL_DEBUG_LIBRARIES_ONLY

Set to TRUE to install only the debug runtime libraries with MSVC tools even if the release runtime libraries are also available.

CMAKE_INSTALL_UCRT_LIBRARIES

Added in version 3.6.

Set to TRUE to install the Windows Universal CRT libraries for app-local deployment (e.g. to Windows XP). This is meaningful only with MSVC from Visual Studio 2015 or higher.

Added in version 3.9: One may set a CMAKE_WINDOWS_KITS_10_DIR environment variable to an absolute path to tell CMake to look for Windows 10 SDKs in a custom location. The specified directory is expected to contain Redist/ucrt/DLLs/* directories.

CMAKE_INSTALL_MFC_LIBRARIES

Set to TRUE to install the MSVC MFC runtime libraries.

CMAKE_INSTALL_OPENMP_LIBRARIES

Set to TRUE to install the MSVC OpenMP runtime libraries

CMAKE_INSTALL_SYSTEM_RUNTIME_DESTINATION

Specify the install(PROGRAMS) <#programs> command DESTINATION option. If not specified, the default is bin on Windows and lib elsewhere.

CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_NO_WARNINGS

Set to TRUE to disable warnings about required library files that do not exist. (For example, Visual Studio Express editions may not provide the redistributable files.)

CMAKE_INSTALL_SYSTEM_RUNTIME_COMPONENT

Added in version 3.3.

Specify the install(PROGRAMS) <#programs> command COMPONENT option. If not specified, no such option will be used.

Added in version 3.10: Support for installing Intel compiler runtimes.

### ProcessorCount
This module provides a command to determine the number of processors/cores.

Load this module in CMake with:

```
include(ProcessorCount)
```

### Commands
This module provides the following command:

ProcessorCount

Determines the number of logical CPU cores available on the machine:

```
ProcessorCount(<variable>)
```

This command sets a variable named <variable> to the number of logical CPU cores available on the machine, if the information can be determined. If successful, the variable is guaranteed to be set to a positive integer (>=1). If the processor count cannot be determined, it is set to 0.

Currently, this functionality is implemented for AIX, Cygwin, FreeBSD, Haiku, HPUX, Linux, macOS, QNX, Sun and Windows.

This command provides an approximation of the number of compute cores available on the current machine, making it useful for parallel building and testing. It is meant to help utilize as much of the machine as seems reasonable, though users should consider other workloads running on the machine before using its full capacity for parallel tasks.

Changed in version 3.15: On Linux, returns the container CPU count instead of the host CPU count.

Note:

This module relies on system-dependent commands to determine the number of processors, which may not always provide accurate information in certain environments. A more generally accurate logical CPU count can be also obtained with the cmake_host_system_information() <#command:cmake_host_system_information>:

```
cmake_host_system_information(RESULT n QUERY NUMBER_OF_LOGICAL_CORES)
```

### Examples
In the following example this module is used in a ctest -S <#cmdoption-ctest-S> dashboard script to determine number of cores to use for a parallel CTest Build Step <#ctest-build-step>:

```
include(ProcessorCount)
ProcessorCount(n)
if(NOT n EQUAL 0)

  set(CTEST_BUILD_FLAGS -j${n})

  set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${n})
endif()
```

### SelectLibraryConfigurations
This module provides a command to automatically set library variables when package is available with multiple Build Configurations <#build-configurations>. It is intended for use in Find Modules <#find-modules> implementing find_package(<PackageName>) <#command:find_package> calls.

Load this module in a CMake find module with:

FindFoo.cmake

```
include(SelectLibraryConfigurations)
```

Supported build configurations are Release and Debug as these are the most common ones in such packages.

Note:

This module has been available since early versions of CMake, when the <PackageName>_LIBRARIES result variable was used for linking found packages. When writing standard find modules, Imported Targets <#imported-targets> should be preferred. In addition to or as an alternative to this module, imported targets provide finer control over linking through the IMPORTED_CONFIGURATIONS <#prop_tgt:IMPORTED_CONFIGURATIONS> property.

### Commands
This module provides the following command:

select_library_configurations

Sets and adjusts library variables based on debug and release build configurations:

```
select_library_configurations(<basename>)
```

This command is a helper for setting the <basename>_LIBRARY and <basename>_LIBRARIES result variables when a library might be provided with multiple build configurations.

The argument is:

<basename>

The base name of the library, used as a prefix for variable names. This is the name of the package as used in the Find<PackageName>.cmake module filename, or the component name, when find module provides them.

Prior to calling this command the following cache variables should be set in the find module (for example, by the find_library() <#command:find_library> command):

<basename>_LIBRARY_RELEASE

A cache variable storing the full path to the Release build of the library. If not set or found, this command will set its value to <basename>_LIBRARY_RELEASE-NOTFOUND.

<basename>_LIBRARY_DEBUG

A cache variable storing the full path to the Debug build of the library. If not set or found, this command will set its value to <basename>_LIBRARY_DEBUG-NOTFOUND.

This command then sets the following local result variables:

<basename>_LIBRARY

A result variable that is set to the value of <basename>_LIBRARY_RELEASE variable if found, otherwise it is set to the value of <basename>_LIBRARY_DEBUG variable if found. If both are found, the release library value takes precedence. If both are not found, it is set to value <basename>_LIBRARY-NOTFOUND. If the CMake Generator <#manual:cmake-generators(7)> in use supports build configurations, then this variable will be a list of found libraries each prepended with the optimized or debug keywords specifying which library should be linked for the given configuration. These keywords are used by the target_link_libraries() <#command:target_link_libraries> command. If a build configuration has not been set or the generator in use does not support build configurations, then this variable value will not contain these keywords.

<basename>_LIBRARIES

A result variable that is set to the same value as the <basename>_LIBRARY variable.

Note:

The select_library_configurations() command should be called before handling standard find module arguments with find_package_handle_standard_args() <#command:find_package_handle_standard_args> to ensure that the <PackageName>_FOUND result variable is correctly set based on <basename>_LIBRARY or other related variables.

### Examples
Setting library variables based on the build configuration inside a find module file:

FindFoo.cmake

```
# Find release and debug build of the library
find_library(Foo_LIBRARY_RELEASE ...)
find_library(Foo_LIBRARY_DEBUG ...)
# Set Foo_LIBRARY and Foo_LIBRARIES result variables
include(SelectLibraryConfigurations)
select_library_configurations(Foo)
# Set Foo_FOUND variable and print result message.
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(

  Foo

  REQUIRED_VARS Foo_LIBRARY ...
)
```

When find module provides components with multiple build configurations:

FindFoo.cmake

```
include(SelectLibraryConfigurations)
foreach(component IN LISTS Foo_FIND_COMPONENTS)

  # ...

  select_library_configurations(Foo_${component})

  # ...
endforeach()
```

A project can then use this find module as follows:

CMakeLists.txt

```
find_package(Foo)
target_link_libraries(project_target PRIVATE ${Foo_LIBRARIES})
# ...
```

### TestForANSIForScope
This module checks whether the CXX compiler restricts the scope of variables declared in a for-init-statement to the loop body.

Load this module in a CMake project with:

```
include(TestForANSIForScope)
```

In early C++ (pre-C++98), variables declared in for(<init-statement> ...) could remain accessible outside the loop after its body (for() { <body> }).

This module defines the following cache variable:

CMAKE_NO_ANSI_FOR_SCOPE

A cache variable containing the result of the check. It will be set to value 0 if the for-init-statement has restricted scope (C++ 98 and newer), and to value 1 if not (ANSI C++).

Note:

As of the C++ 98 standard, variables declared in a for-init-statement are restricted to the loop body, making this behavior obsolete.

### Examples
Including this module will check the for() loop scope behavior and define the CMAKE_NO_ANSI_FOR_SCOPE cache variable:

CMakeLists.txt

```
include(TestForANSIForScope)
file(

  CONFIGURE

  OUTPUT config.h

  CONTENT "#cmakedefine CMAKE_NO_ANSI_FOR_SCOPE"
)
```

which can be then used in a C++ program:

example.cxx

```
#include "config.h"
#ifdef CMAKE_NO_ANSI_FOR_SCOPE
#  define for if(false) {} else for
#endif
```

### See Also
•

The CMakeBackwardCompatibilityCXX <#module:CMakeBackwardCompatibilityCXX> module.

### TestForANSIStreamHeaders
This module checks whether the CXX compiler supports standard library headers without the .h extension (e.g. <iostream>).

Load this module in a CMake project with:

```
include(TestForANSIStreamHeaders)
```

Early versions of C++ (pre-C++98) didn't support including standard headers without extensions.

This module defines the following cache variable:

CMAKE_NO_ANSI_STREAM_HEADERS

A cache variable containing the result of the check. It will be set to value 0 if the standard headers can be included without the .h extension (C++ 98 and newer), and to value 1 if .h is required (ANSI C++).

Note:

The C++ standard headers without extensions got formally introduced in the C++ 98 standard, making this issue obsolete.

### Examples
Including this module will check how the C++ standard headers can be included and define the CMAKE_NO_ANSI_STREAM_HEADERS cache variable:

CMakeLists.txt

```
include(TestForANSIStreamHeaders)
file(

  CONFIGURE

  OUTPUT config.h

  CONTENT "#cmakedefine CMAKE_NO_ANSI_STREAM_HEADERS"
)
```

C++ program can then include the available header conditionally:

example.cxx

```
#include "config.h"
#ifdef CMAKE_NO_ANSI_STREAM_HEADERS
#  include <iostream.h>
#else
#  include <iostream>
#endif
int main() { ... }
```

### See Also
•

The CMakeBackwardCompatibilityCXX <#module:CMakeBackwardCompatibilityCXX> module.

### TestForSSTREAM
This module checks whether the C++ standard header <sstream> exists and functions correctly.

Load this module in a CMake project with:

```
include(TestForSSTREAM)
```

In early versions of C++ (pre-C++98), the <sstream> header was not formally standardized and may not have been available.

This module defines the following cache variables:

CMAKE_NO_ANSI_STRING_STREAM

A cache variable indicating whether the <sstream> header is available. It will be set to value 0 if <sstream> is available (C++ 98 and newer), and to value 1 if <sstream> is missing (ANSI C++).

CMAKE_HAS_ANSI_STRING_STREAM

A cache variable that is the opposite of CMAKE_NO_ANSI_STRING_STREAM (true if <sstream> is available and false if <sstream> is missing).

Note:

The <sstream> header was formally introduced in the C++ 98 standard, making this check obsolete for modern compilers.

### Examples
Including this module will check for <sstream> support and define the CMAKE_NO_ANSI_STRING_STREAM cache variable:

CMakeLists.txt

```
include(TestForSSTREAM)
file(

  CONFIGURE

  OUTPUT config.h

  CONTENT "#cmakedefine CMAKE_NO_ANSI_STRING_STREAM"
)
```

Then it can be used in a C++ program:

example.cxx

```
#include "config.h"
#ifndef CMAKE_NO_ANSI_STRING_STREAM
#  include <sstream>
#endif
int main() { ... }
```

### See Also
•

The CMakeBackwardCompatibilityCXX <#module:CMakeBackwardCompatibilityCXX> module.

### TestForSTDNamespace
This module checks whether the CXX compiler supports the std namespace for the C++ Standard Library.

Load this module in a CMake project with:

```
include(TestForSTDNamespace)
```

Early versions of C++ (pre-C++98) did not have a requirement for a dedicated namespace of C++ Standard Template Library (STL) components (e.g. list, etc.) and other parts of the C++ Standard Library (such as I/O streams cout, endl, etc), so they were available globally.

This module defines the following cache variable:

CMAKE_NO_STD_NAMESPACE

A cache variable containing the result of the check. It will be set to value 0 if the std namespace is supported (C++ 98 and newer), and to value 1 if not (ANSI C++).

Note:

The std namespace got formally introduced in C++ 98 standard, making this issue obsolete.

### Examples
Including this module will check for the std namespace support and define the CMAKE_NO_STD_NAMESPACE cache variable:

CMakeLists.txt

```
include(TestForSTDNamespace)
file(

  CONFIGURE

  OUTPUT config.h

  CONTENT "#cmakedefine CMAKE_NO_STD_NAMESPACE"
)
```

which can be then used in a C++ program to define the missing namespace:

example.cxx

```
#include "config.h"
#ifdef CMAKE_NO_STD_NAMESPACE
#  define std
#endif
```

### See Also
•

The CMakeBackwardCompatibilityCXX <#module:CMakeBackwardCompatibilityCXX> module.

### UseEcos
This module defines variables and provides commands required to build an eCos application.

Load this module in a CMake project with:

```
include(UseEcos)
```

### Commands
This module provides the following commands:

### Building an eCos Application
ecos_add_include_directories

Adds the eCos include directories for the current CMakeLists.txt file:

```
ecos_add_include_directories()
```

ecos_adjust_directory

Adjusts the paths of given source files:

```
ecos_adjust_directory(<var> <sources>...)
```

This command modifies the paths of the source files <sources>... to make them suitable for use with ecos_add_executable(), and stores them in the variable <var>.

<var>

Result variable name holding a new list of source files with adjusted paths.

<sources>...

A list of relative or absolute source files to adjust their paths.

Use this command when the actual sources are located one level upwards. A ../ has to be prepended in front of every source file that is given as a relative path.

ecos_add_executable

Creates an eCos application executable:

```
ecos_add_executable(<name> <sources>...)
```

<name>

The name of the executable.

<sources>...

A list of all source files, where the path has been adjusted beforehand by calling the ecos_adjust_directory().

This command also sets the ECOS_DEFINITIONS local variable, holding some common compile definitions.

### Selecting the Toolchain
ecos_use_arm_elf_tools

Enables the ARM ELF toolchain for the directory where it is called:

```
ecos_use_arm_elf_tools()
```

Use this command, when compiling for the xscale processor.

ecos_use_i386_elf_tools

Enables the i386 ELF toolchain for the directory where it is called:

```
ecos_use_i386_elf_tools()
```

ecos_use_ppc_eabi_tools

Enables the PowerPC toolchain for the directory where it is called:

```
ecos_use_ppc_eabi_tools()
```

### Variables
This module also defines the following variables:

ECOSCONFIG_EXECUTABLE

Cache variable that contains a path to the ecosconfig executable (the eCos configuration program).

ECOS_CONFIG_FILE

A local variable that defaults to ecos.ecc. If eCos configuration file has a different name, adjust this variable before calling the ecos_add_executable().

### Examples
The following example demonstrates defining an eCos executable target in a project that follows the common eCos convention of listing source files in a ProjectSources.txt file, located one directory above the current CMakeLists.txt:

CMakeLists.txt

```
include(UseEcos)
# Add the eCos include directories.
ecos_add_include_directories()
# Include the file with the eCos sources list. This file, for example, defines
# a list of eCos sources:
#   set(sources file_1.cxx file_2.cxx file_3.cxx)
include(../ProjectSources.txt)
# When using such directory structure, relative source paths must be adjusted:
ecos_adjust_directory(adjusted_sources ${sources})
# Create eCos executable.
ecos_add_executable(ecos_app ${adjusted_sources})
```

### UseJava
This file provides support for Java. It is assumed that FindJava <#module:FindJava> has already been loaded. See FindJava <#module:FindJava> for information on how to load Java into your CMake project.

Load this module in a CMake project with:

```
include(UseJava)
```

### Synopsis

```
Creating and Installing JARS

  add_jar (<target_name> [SOURCES] <source1> [<source2>...] ...)

  install_jar (<target_name> DESTINATION <destination> [COMPONENT <component>])

  install_jni_symlink (<target_name> DESTINATION <destination> [COMPONENT <component>])
Header Generation

  create_javah ((TARGET <target> | GENERATED_FILES <VAR>) CLASSES <class>... ...)
Exporting JAR Targets

  install_jar_exports (TARGETS <jars>... FILE <filename> DESTINATION <destination> ...)

  export_jars (TARGETS <jars>... [NAMESPACE <namespace>] FILE <filename>)
Finding JARs

  find_jar (<VAR> NAMES <name1> [<name2>...] [PATHS <path1> [<path2>... ENV <var>]] ...)
Creating Java Documentation

  create_javadoc (<VAR> (PACKAGES <pkg1> [<pkg2>...] | FILES <file1> [<file2>...]) ...)
```

### Creating And Installing JARs
add_jar

Creates a jar file containing java objects and, optionally, resources:

```
add_jar(<target_name>

        [SOURCES] <source1> [<source2>...] [<resource1>...]

        [RESOURCES NAMESPACE <ns1> <resource1>... [NAMESPACE <nsX> <resourceX>...]... ]

        [INCLUDE_JARS <jar1> [<jar2>...]]

        [INCLUDE_MODULES <jar1> [<jar2>...]]

        [ENTRY_POINT <entry>]

        [VERSION <version>]

        [MANIFEST <manifest>]

        [OUTPUT_NAME <name>]

        [OUTPUT_DIR <dir>]

        [GENERATE_NATIVE_HEADERS <target>

                                 [DESTINATION (<dir>|INSTALL <dir> [BUILD <dir>])]]

        )
```

This command creates a <target_name>.jar. It compiles the given <source> files and adds the given <resource> files to the jar file. Source files can be java files or listing files (prefixed by @). If only resource files are given then just a jar file is created.

SOURCES

Compiles the specified source files and adds the result in the jar file. Added in version 3.4: Support for response files, prefixed by @.

RESOURCES

Added in version 3.21.

Adds the named <resource> files to the jar by stripping the source file path and placing the file beneath <ns> within the jar.

For example:

```
RESOURCES NAMESPACE "/com/my/namespace" "a/path/to/resource.txt"
```

results in a resource accessible via /com/my/namespace/resource.txt within the jar.

Resources may be added without adjusting the namespace by adding them to the list of SOURCES (original behavior), in this case, resource paths must be relative to CMAKE_CURRENT_SOURCE_DIR. Adding resources without using the RESOURCES parameter in out of source builds will almost certainly result in confusion.

Note:

Adding resources via the SOURCES parameter relies upon a hard-coded list of file extensions which are tested to determine whether they compile (e.g. File.java). SOURCES files which match the extensions are compiled. Files which do not match are treated as resources. To include uncompiled resources matching those file extensions use the RESOURCES parameter.

INCLUDE_JARS

The list of jars are added to the classpath when compiling the java sources and also to the dependencies of the target. INCLUDE_JARS also accepts other target names created by add_jar(). For backwards compatibility, jar files listed as sources are ignored (as they have been since the first version of this module).

INCLUDE_MODULES

Added in version 4.3.

The list of jars are added to the module path when building the java sources and also to the dependencies of the target. INCLUDE_MODULES also accepts other target names created by add_jar().

ENTRY_POINT

Defines an entry point in the jar file.

VERSION

Adds a version to the target output name. The following example will create a jar file with the name shibboleet-1.2.0.jar and will create a symlink shibboleet.jar pointing to the jar with the version information.

```
add_jar(shibboleet shibbotleet.java VERSION 1.2.0)
```

MANIFEST

Defines a custom manifest for the jar.

OUTPUT_NAME

Specify a different output name for the target.

OUTPUT_DIR

Sets the directory where the jar file will be generated. If not specified, CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> is used as the output directory.

GENERATE_NATIVE_HEADERS

Added in version 3.11.

Generates native header files for methods declared as native. These files provide the connective glue that allow your Java and C code to interact. An INTERFACE target will be created for an easy usage of generated files. Sub-option DESTINATION can be used to specify the output directory for generated header files.

This option requires, at least, version 1.8 of the JDK.

For an optimum usage of this option, it is recommended to include module JNI before any call to add_jar(). The produced target for native headers can then be used to compile C/C++ sources with the target_link_libraries() <#command:target_link_libraries> command.

```
find_package(JNI)
add_jar(foo foo.java GENERATE_NATIVE_HEADERS foo-native)
add_library(bar bar.cpp)
target_link_libraries(bar PRIVATE foo-native)
```

Added in version 3.20: DESTINATION sub-option now supports the possibility to specify different output directories for BUILD and INSTALL steps. If BUILD directory is not specified, a default directory will be used.

To export the interface target generated by GENERATE_NATIVE_HEADERS option, sub-option INSTALL of DESTINATION is required:

```
add_jar(foo foo.java GENERATE_NATIVE_HEADERS foo-native

                     DESTINATION INSTALL include)
install(TARGETS foo-native EXPORT native)
install(DIRECTORY "$<TARGET_PROPERTY:foo-native,NATIVE_HEADERS_DIRECTORY>/"

        DESTINATION include)
install(EXPORT native DESTINATION /to/export NAMESPACE foo)
```

Some variables can be set to customize the behavior of add_jar() as well as the java compiler:

CMAKE_JAVA_COMPILE_FLAGS

Specify additional flags to java compiler.

CMAKE_JAVA_INCLUDE_PATH

Specify additional paths to the class path.

CMAKE_JNI_TARGET

If the target is a JNI library, sets this boolean variable to TRUE to enable creation of a JNI symbolic link (see also install_jni_symlink()).

CMAKE_JAR_CLASSES_PREFIX

If multiple jars should be produced from the same java source filetree, to prevent the accumulation of duplicate class files in subsequent jars, set/reset CMAKE_JAR_CLASSES_PREFIX prior to calling the add_jar():

```
set(CMAKE_JAR_CLASSES_PREFIX com/redhat/foo)
add_jar(foo foo.java)
set(CMAKE_JAR_CLASSES_PREFIX com/redhat/bar)
add_jar(bar bar.java)
```

The add_jar() function sets the following target properties on <target_name>:

INSTALL_FILES

The files which should be installed. This is used by install_jar().

JNI_SYMLINK

The JNI symlink which should be installed. This is used by install_jni_symlink().

JAR_FILE

The location of the jar file so that you can include it.

CLASSDIR

The directory where the class files can be found. For example to use them with javah.

NATIVE_HEADERS_DIRECTORY

Added in version 3.20.

The directory where native headers are generated. Defined when option GENERATE_NATIVE_HEADERS is specified.

install_jar

This command installs the jar file to the given destination:

```
install_jar(<target_name> <destination>)
install_jar(<target_name> DESTINATION <destination> [COMPONENT <component>])
```

This command installs the <target_name> file to the given <destination>. It should be called in the same scope as add_jar() or it will fail.

Added in version 3.4: The second signature with DESTINATION and COMPONENT options.

DESTINATION

Specify the directory on disk to which a file will be installed.

COMPONENT

Specify an installation component name with which the install rule is associated, such as "runtime" or "development".

The install_jar() command sets the following target properties on <target_name>:

INSTALL_DESTINATION

Holds the <destination> as described above, and is used by install_jar_exports().

install_jni_symlink

Installs JNI symlinks for target generated by add_jar():

```
install_jni_symlink(<target_name> <destination>)
install_jni_symlink(<target_name> DESTINATION <destination> [COMPONENT <component>])
```

This command installs the <target_name> JNI symlinks to the given <destination>. It should be called in the same scope as add_jar() or it will fail.

Added in version 3.4: The second signature with DESTINATION and COMPONENT options.

DESTINATION

Specify the directory on disk to which a file will be installed.

COMPONENT

Specify an installation component name with which the install rule is associated, such as "runtime" or "development".

Utilize the following commands to create a JNI symbolic link:

```
set(CMAKE_JNI_TARGET TRUE)
add_jar(shibboleet shibbotleet.java VERSION 1.2.0)
install_jar(shibboleet ${LIB_INSTALL_DIR}/shibboleet)
install_jni_symlink(shibboleet ${JAVA_LIB_INSTALL_DIR})
```

### Header Generation
create_javah

Added in version 3.4.

Generates C header files for java classes:

```
create_javah(TARGET <target> | GENERATED_FILES <VAR>

             CLASSES <class>...

             [CLASSPATH <classpath>...]

             [DEPENDS <depend>...]

             [OUTPUT_NAME <path>|OUTPUT_DIR <path>]

             )
```

Deprecated since version 3.11: This command will no longer be supported starting with version 10 of the JDK due to the suppression of javah tool <https://openjdk.org/jeps/313>. The add_jar(GENERATE_NATIVE_HEADERS) command should be used instead.

Create C header files from java classes. These files provide the connective glue that allow your Java and C code to interact.

There are two main signatures for create_javah(). The first signature returns generated files through variable specified by the GENERATED_FILES option. For example:

```
create_javah(GENERATED_FILES files_headers

  CLASSES org.cmake.HelloWorld

  CLASSPATH hello.jar
)
```

The second signature for create_javah() creates a target which encapsulates header files generation. E.g.

```
create_javah(TARGET target_headers

  CLASSES org.cmake.HelloWorld

  CLASSPATH hello.jar
)
```

Both signatures share same options.

CLASSES

Specifies Java classes used to generate headers.

CLASSPATH

Specifies various paths to look up classes. Here .class files, jar files or targets created by command add_jar can be used.

DEPENDS

Targets on which the javah target depends.

OUTPUT_NAME

Concatenates the resulting header files for all the classes listed by option CLASSES into <path>. Same behavior as option -o of javah tool.

OUTPUT_DIR

Sets the directory where the header files will be generated. Same behavior as option -d of javah tool. If not specified, CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> is used as the output directory.

### Exporting JAR Targets
install_jar_exports

Added in version 3.7.

Installs a target export file:

```
install_jar_exports(TARGETS <jars>...

                    [NAMESPACE <namespace>]

                    FILE <filename>

                    DESTINATION <destination> [COMPONENT <component>])
```

This command installs a target export file <filename> for the named jar targets to the given <destination> directory. Its function is similar to that of install(EXPORT) <#export>.

TARGETS

List of targets created by add_jar() command.

NAMESPACE

Added in version 3.9.

The <namespace> value will be prepend to the target names as they are written to the import file.

FILE

Specify name of the export file.

DESTINATION

Specify the directory on disk to which a file will be installed.

COMPONENT

Specify an installation component name with which the install rule is associated, such as "runtime" or "development".

export_jars

Added in version 3.7.

Writes a target export file:

```
export_jars(TARGETS <jars>...

            [NAMESPACE <namespace>]

            FILE <filename>)
```

This command writes a target export file <filename> for the named <jars> targets. Its function is similar to that of export() <#command:export>.

TARGETS

List of targets created by add_jar() command.

NAMESPACE

Added in version 3.9.

The <namespace> value will be prepend to the target names as they are written to the import file.

FILE

Specify name of the export file.

### Finding JARs
find_jar

Finds the specified jar file:

```
find_jar(<VAR>

         <name> | NAMES <name1> [<name2>...]

         [PATHS <path1> [<path2>... ENV <var>]]

         [VERSIONS <version1> [<version2>]]

         [DOC "cache documentation string"]

        )
```

This command is used to find a full path to the named jar. A cache entry named by <VAR> is created to store the result of this command. If the full path to a jar is found the result is stored in the variable and the search will not repeated unless the variable is cleared. If nothing is found, the result will be <VAR>-NOTFOUND, and the search will be attempted again next time find_jar() is invoked with the same variable.

NAMES

Specify one or more possible names for the jar file.

PATHS

Specify directories to search in addition to the default locations. The ENV var sub-option reads paths from a system environment variable.

VERSIONS

Specify jar versions.

DOC

Specify the documentation string for the <VAR> cache entry.

### Creating Java Documentation
create_javadoc

Creates java documentation based on files and packages:

```
create_javadoc(<VAR>

               (PACKAGES <pkg1> [<pkg2>...] | FILES <file1> [<file2>...])

               [SOURCEPATH <sourcepath>]

               [CLASSPATH <classpath>]

               [INSTALLPATH <install path>]

               [DOCTITLE <the documentation title>]

               [WINDOWTITLE <the title of the document>]

               [AUTHOR (TRUE|FALSE)]

               [USE (TRUE|FALSE)]

               [VERSION (TRUE|FALSE)]

               )
```

The create_javadoc() command can be used to create java documentation. There are two main signatures for create_javadoc().

The first signature works with package names on a path with source files:

```
create_javadoc(my_example_doc

               PACKAGES com.example.foo com.example.bar

               SOURCEPATH "${CMAKE_CURRENT_SOURCE_DIR}"

               CLASSPATH ${CMAKE_JAVA_INCLUDE_PATH}

               WINDOWTITLE "My example"

               DOCTITLE "<h1>My example</h1>"

               AUTHOR TRUE

               USE TRUE

               VERSION TRUE

              )
```

The second signature for create_javadoc() works on a given list of files:

```
create_javadoc(my_example_doc

               FILES java/A.java java/B.java

               CLASSPATH ${CMAKE_JAVA_INCLUDE_PATH}

               WINDOWTITLE "My example"

               DOCTITLE "<h1>My example</h1>"

               AUTHOR TRUE

               USE TRUE

               VERSION TRUE

              )
```

Both signatures share most of the options. For more details please read the javadoc manpage.

PACKAGES

Specify java packages.

FILES

Specify java source files. If relative paths are specified, they are relative to CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>.

SOURCEPATH

Specify the directory where to look for packages. By default, CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR> directory is used.

CLASSPATH

Specify where to find user class files. Same behavior as option -classpath of javadoc tool.

INSTALLPATH

Specify where to install the java documentation. If you specified, the documentation will be installed to ${CMAKE_INSTALL_PREFIX}/share/javadoc/<VAR>.

DOCTITLE

Specify the title to place near the top of the overview summary file. Same behavior as option -doctitle of javadoc tool.

WINDOWTITLE

Specify the title to be placed in the HTML <title> tag. Same behavior as option -windowtitle of javadoc tool.

AUTHOR

When value TRUE is specified, includes the @author text in the generated docs. Same behavior as option -author of javadoc tool.

USE

When value TRUE is specified, creates class and package usage pages. Includes one Use page for each documented class and package. Same behavior as option -use of javadoc tool.

VERSION

When value TRUE is specified, includes the version text in the generated docs. Same behavior as option -version of javadoc tool.

### UseSWIG
This module provides support for SWIG. It is assumed that FindSWIG <#module:FindSWIG> module has already been loaded.

Load this module in a CMake project with:

```
include(UseSWIG)
```

### CMake Commands
The following command is defined for use with SWIG:

swig_add_library

Added in version 3.8.

Define swig module with given name and specified language:

```
swig_add_library(<name>

                 [TYPE <SHARED|MODULE|STATIC|USE_BUILD_SHARED_LIBS>]

                 LANGUAGE <language>

                 [NO_PROXY]

                 [DEBUG_POSTFIX <postfix>]

                 [OUTPUT_DIR <directory>]

                 [OUTFILE_DIR <directory>]

                 SOURCES <file>...

                )
```

Targets created with the swig_add_library command have the same capabilities as targets created with the add_library() <#command:add_library> command, so those targets can be used with any command expecting a target (e.g. target_link_libraries() <#command:target_link_libraries>).

Changed in version 3.13: This command creates a target with the specified <name> when policy CMP0078 <#policy:CMP0078> is set to NEW. Otherwise, the legacy behavior will choose a different target name and store it in the SWIG_MODULE_<name>_REAL_NAME variable.

Changed in version 3.15: Alternate library name (set with the OUTPUT_NAME <#prop_tgt:OUTPUT_NAME> property, for example) will be passed on to Python and CSharp wrapper libraries.

Changed in version 3.21: Generated library use standard naming conventions for CSharp language when policy CMP0122 <#policy:CMP0122> is set to NEW. Otherwise, the legacy behavior is applied.

Note:

For multi-config generators, this module does not support configuration-specific files generated by SWIG. All build configurations must result in the same generated source file.

Note:

For Makefile Generators <#makefile-generators>, if, for some sources, the USE_SWIG_DEPENDENCIES property is FALSE, swig_add_library does not track file dependencies, so depending on the <name>_swig_compilation custom target is required for targets which require the swig-generated files to exist. Other generators may depend on the source files that would be generated by SWIG.

TYPE

SHARED, MODULE and STATIC have the same semantic as for the add_library() <#command:add_library> command. If USE_BUILD_SHARED_LIBS is specified, the library type will be STATIC or SHARED based on whether the current value of the BUILD_SHARED_LIBS <#variable:BUILD_SHARED_LIBS> variable is ON. If no type is specified, MODULE will be used.

LANGUAGE

Specify the target language. Added in version 3.1: Go and Lua language support.

Added in version 3.2: R language support.

Added in version 3.18: Fortran language support.

NO_PROXY

Added in version 3.12.

Prevent the generation of the wrapper layer (swig -noproxy option).

DEBUG_POSTFIX

Added in version 4.2.

Manage the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property. Currently, only meaningful for the python language.

If the DEBUG_CONFIGURATIONS <#prop_gbl:DEBUG_CONFIGURATIONS> global property is defined, define the <CONFIG>_POSTFIX <#prop_tgt:<CONFIG>_POSTFIX> target property for each debug configuration.

OUTPUT_DIR

Added in version 3.12.

Specify where to write the language specific files (swig -outdir option). If not given, the CMAKE_SWIG_OUTDIR variable will be used. If neither is specified, the default depends on the value of the UseSWIG_MODULE_VERSION variable as follows:

- If UseSWIG_MODULE_VERSION is 1 or is undefined, output is written to the CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> directory.

- If UseSWIG_MODULE_VERSION is 2, a dedicated directory will be used. The path of this directory can be retrieved from the SWIG_SUPPORT_FILES_DIRECTORY target property.

OUTFILE_DIR

Added in version 3.12.

Specify an output directory name where the generated source file will be placed (swig -o option). If not specified, the SWIG_OUTFILE_DIR variable will be used. If neither is specified, OUTPUT_DIR or CMAKE_SWIG_OUTDIR is used instead.

SOURCES

List of sources for the library. Files with extension .i will be identified as sources for the SWIG tool. Other files will be handled in the standard way. Added in version 3.14: This behavior can be overridden by specifying the variable SWIG_SOURCE_FILE_EXTENSIONS.

Note:

If UseSWIG_MODULE_VERSION is set to 2, it is strongly recommended to use a dedicated directory unique to the target when either the OUTPUT_DIR option or the CMAKE_SWIG_OUTDIR variable are specified. The output directory contents are erased as part of the target build, so to prevent interference between targets or losing other important files, each target should have its own dedicated output directory.

### Properties on Source Files
Source file properties on module files must be set before the invocation of the swig_add_library command to specify special behavior of SWIG and ensure generated files will receive the required settings.

CPLUSPLUS

Call SWIG in c++ mode. For example:

```
set_property(SOURCE mymod.i PROPERTY CPLUSPLUS ON)
swig_add_library(mymod LANGUAGE python SOURCES mymod.i)
```

SWIG_FLAGS

Deprecated since version 3.12: Replaced with the fine-grained properties that follow.

Pass custom flags to the SWIG executable.

INCLUDE_DIRECTORIES, COMPILE_DEFINITIONS and COMPILE_OPTIONS

Added in version 3.12.

Add custom flags to SWIG compiler and have same semantic as properties INCLUDE_DIRECTORIES <#prop_sf:INCLUDE_DIRECTORIES>, COMPILE_DEFINITIONS <#prop_sf:COMPILE_DEFINITIONS> and COMPILE_OPTIONS <#prop_sf:COMPILE_OPTIONS>.

USE_TARGET_INCLUDE_DIRECTORIES

Added in version 3.13.

If set to TRUE, contents of target property INCLUDE_DIRECTORIES <#prop_tgt:INCLUDE_DIRECTORIES> will be forwarded to SWIG compiler. If set to FALSE target property INCLUDE_DIRECTORIES <#prop_tgt:INCLUDE_DIRECTORIES> will be ignored. If not set, target property SWIG_USE_TARGET_INCLUDE_DIRECTORIES will be considered.

GENERATED_INCLUDE_DIRECTORIES, GENERATED_COMPILE_DEFINITIONS and GENERATED_COMPILE_OPTIONS

Added in version 3.12.

Add custom flags to the C/C++ generated source. They will fill, respectively, properties INCLUDE_DIRECTORIES <#prop_sf:INCLUDE_DIRECTORIES>, COMPILE_DEFINITIONS <#prop_sf:COMPILE_DEFINITIONS> and COMPILE_OPTIONS <#prop_sf:COMPILE_OPTIONS> of generated C/C++ file.

DEPENDS

Added in version 3.12.

Specify additional dependencies to the source file.

USE_SWIG_DEPENDENCIES

Added in version 3.20.

If set to TRUE, implicit dependencies are generated by the swig tool itself. This property is only meaningful for Makefile <#makefile-generators>, Ninja <#ninja-generators>, Xcode <#generator:Xcode>, and Visual Studio <#visual-studio-generators> generators. Default value is FALSE.

Added in version 3.21: Added the support of Xcode <#generator:Xcode> generator.

Added in version 3.22: Added the support of Visual Studio Generators <#visual-studio-generators>.

SWIG_MODULE_NAME

Specify the actual import name of the module in the target language. This is required if it cannot be scanned automatically from source or different from the module file basename. For example:

```
set_property(SOURCE mymod.i PROPERTY SWIG_MODULE_NAME mymod_realname)
```

Changed in version 3.14: If policy CMP0086 <#policy:CMP0086> is set to NEW, -module <module_name> is passed to SWIG compiler.

OUTPUT_DIR

Added in version 3.19.

Specify where to write the language specific files (swig -outdir option) for the considered source file. If not specified, the other ways to define the output directory applies (see OUTPUT_DIR option of swig_add_library() command).

OUTFILE_DIR

Added in version 3.19.

Specify an output directory where the generated source file will be placed (swig -o option) for the considered source file. If not specified, OUTPUT_DIR source property will be used. If neither are specified, the other ways to define output file directory applies (see OUTFILE_DIR option of swig_add_library() command).

### Properties on Targets
Target library properties can be set to apply same configuration to all SWIG input files.

SWIG_INCLUDE_DIRECTORIES, SWIG_COMPILE_DEFINITIONS and SWIG_COMPILE_OPTIONS

Added in version 3.12.

These properties will be applied to all SWIG input files and have same semantic as target properties INCLUDE_DIRECTORIES <#prop_tgt:INCLUDE_DIRECTORIES>, COMPILE_DEFINITIONS <#prop_tgt:COMPILE_DEFINITIONS> and COMPILE_OPTIONS <#prop_tgt:COMPILE_OPTIONS>.

```
set (UseSWIG_TARGET_NAME_PREFERENCE STANDARD)
swig_add_library(mymod LANGUAGE python SOURCES mymod.i)
set_property(TARGET mymod PROPERTY SWIG_COMPILE_DEFINITIONS MY_DEF1 MY_DEF2)
set_property(TARGET mymod PROPERTY SWIG_COMPILE_OPTIONS -bla -blb)
```

SWIG_USE_TARGET_INCLUDE_DIRECTORIES

Added in version 3.13.

If set to TRUE, contents of target property INCLUDE_DIRECTORIES <#prop_tgt:INCLUDE_DIRECTORIES> will be forwarded to SWIG compiler. If set to FALSE or not defined, target property INCLUDE_DIRECTORIES <#prop_tgt:INCLUDE_DIRECTORIES> will be ignored. This behavior can be overridden by specifying source property USE_TARGET_INCLUDE_DIRECTORIES.

SWIG_GENERATED_INCLUDE_DIRECTORIES, SWIG_GENERATED_COMPILE_DEFINITIONS and SWIG_GENERATED_COMPILE_OPTIONS

Added in version 3.12.

These properties will populate, respectively, properties INCLUDE_DIRECTORIES <#prop_sf:INCLUDE_DIRECTORIES>, COMPILE_DEFINITIONS <#prop_sf:COMPILE_DEFINITIONS> and COMPILE_FLAGS <#prop_sf:COMPILE_FLAGS> of all generated C/C++ files.

SWIG_DEPENDS

Added in version 3.12.

Add dependencies to all SWIG input files.

### Read-only Target Properties
The following target properties are output properties and can be used to get information about support files generated by SWIG interface compilation.

SWIG_SUPPORT_FILES

Added in version 3.12.

This output property list of wrapper files generated during SWIG compilation.

```
set (UseSWIG_TARGET_NAME_PREFERENCE STANDARD)
swig_add_library(mymod LANGUAGE python SOURCES mymod.i)
get_property(support_files TARGET mymod PROPERTY SWIG_SUPPORT_FILES)
```

Note:

Only most principal support files are listed. In case some advanced features of SWIG are used (for example %template), associated support files may not be listed. Prefer to use the SWIG_SUPPORT_FILES_DIRECTORY property to handle support files.

SWIG_SUPPORT_FILES_DIRECTORY

Added in version 3.12.

This output property specifies the directory where support files will be generated.

Note:

When source property OUTPUT_DIR is defined, multiple directories can be specified as part of SWIG_SUPPORT_FILES_DIRECTORY.

### CMake Variables
Some variables can be set to customize the behavior of swig_add_library as well as SWIG:

UseSWIG_MODULE_VERSION

Added in version 3.12.

Specify different behaviors for UseSWIG module.

- Set to 1 or undefined: Legacy behavior is applied.

- Set to 2: A new strategy is applied regarding support files: the output directory of support files is erased before SWIG interface compilation.

CMAKE_SWIG_FLAGS

Add flags to all swig calls.

CMAKE_SWIG_OUTDIR

Specify where to write the language specific files (swig -outdir option).

SWIG_OUTFILE_DIR

Added in version 3.8.

Specify an output directory name where the generated source file will be placed. If not specified, CMAKE_SWIG_OUTDIR is used.

SWIG_MODULE_<name>_EXTRA_DEPS

Specify extra dependencies for the generated module for <name>.

SWIG_SOURCE_FILE_EXTENSIONS

Added in version 3.14.

Specify a list of source file extensions to override the default behavior of considering only .i files as sources for the SWIG tool. For example:

```
set(SWIG_SOURCE_FILE_EXTENSIONS ".i" ".swg")
```

SWIG_USE_SWIG_DEPENDENCIES

Added in version 3.20.

If set to TRUE, implicit dependencies are generated by the swig tool itself. This variable is only meaningful for Makefile <#makefile-generators>, Ninja <#ninja-generators>, Xcode <#generator:Xcode>, and Visual Studio <#visual-studio-generators> generators. Default value is FALSE.

Source file property USE_SWIG_DEPENDENCIES, if not defined, will be initialized with the value of this variable.

Added in version 3.21: Added the support of Xcode <#generator:Xcode> generator.

Added in version 3.22: Added the support of Visual Studio Generators <#visual-studio-generators>.

### Deprecated Commands
swig_link_libraries

Deprecated since version 3.13: Use target_link_libraries() <#command:target_link_libraries> with the standard target name, or with ${SWIG_MODULE_<name>_REAL_NAME} for legacy target naming.

Link libraries to swig module:

```
swig_link_libraries(<name> <item>...)
```

This command has same capabilities as target_link_libraries() <#command:target_link_libraries> command.

Note:

When policy CMP0078 <#policy:CMP0078> is set to NEW, swig_add_library() creates a standard target with the specified <name> and target_link_libraries() <#command:target_link_libraries> must be used instead of this command. With the legacy behavior (when CMP0078 <#policy:CMP0078> is set to OLD and the UseSWIG_TARGET_NAME_PREFERENCE variable is set to "LEGACY", or in CMake versions prior to 3.12), it is preferable to use target_link_libraries(${SWIG_MODULE_<name>_REAL_NAME} ...) instead of this command.

### UsewxWidgets
This module serves as a convenience wrapper for using the wxWidgets library (formerly known as wxWindows) and propagates its usage requirements, such as library directories, include directories, and compiler flags, into the current directory scope for use by targets.

Load this module in a CMake project with:

```
include(UsewxWidgets)
```

This module calls include_directories() <#command:include_directories> and link_directories() <#command:link_directories>, sets compile definitions for the current directory and appends some compile flags to use wxWidgets library after calling the find_package(wxWidgets) <#module:FindwxWidgets>.

### Examples
Include this module in a project after finding wxWidgets to configure its usage requirements:

CMakeLists.txt

```
# Note that for MinGW users the order of libraries is important.
find_package(wxWidgets COMPONENTS net gl core base)
add_library(example example.cxx)
if(wxWidgets_FOUND)

  include(UsewxWidgets)

  # Link wxWidgets libraries for each dependent executable/library target.

  target_link_libraries(example PRIVATE ${wxWidgets_LIBRARIES})
endif()
```

As of CMake 3.27, a better approach is to link only the wxWidgets::wxWidgets <#module:FindwxWidgets> imported target to specific targets that require it, rather than including this module. Imported targets provide better control of the package usage properties, such as include directories and compile flags, by applying them only to the targets they are linked to, avoiding unnecessary propagation to all targets in the current directory.

CMakeLists.txt

```
find_package(wxWidgets COMPONENTS net gl core base)
add_library(example example.cxx)
# Link the imported target for each dependent executable/library target.
target_link_libraries(example PRIVATE wxWidgets::wxWidgets)
```

### See Also
•

The FindwxWidgets <#module:FindwxWidgets> module to find wxWidgets.

## FIND MODULES
These modules search for third-party software. They are normally called through the find_package() <#command:find_package> command.

### FindALSA
Finds the Advanced Linux Sound Architecture (ALSA) library (asound):

```
find_package(ALSA [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

ALSA::ALSA

Added in version 3.12.

Target encapsulating the ALSA library usage requirements. This target is available only if ALSA is found.

### Result Variables
This module defines the following variables:

ALSA_FOUND

Boolean indicating whether the (requested version of) ALSA library was found.

ALSA_VERSION

Added in version 4.2.

The version of ALSA found.

ALSA_LIBRARIES

List of libraries needed for linking to use ALSA library.

ALSA_INCLUDE_DIRS

Include directories containing headers needed to use ALSA library.

### Cache Variables
The following cache variables may also be set:

ALSA_INCLUDE_DIR

The ALSA include directory.

ALSA_LIBRARY

The absolute path of the asound library.

### Deprecated Variables
The following variables are provided for backward compatibility:

ALSA_VERSION_STRING

Deprecated since version 4.2: Superseded by the ALSA_VERSION.

The version of ALSA found.

### Examples
Finding the ALSA library and linking it to a project target:

```
find_package(ALSA)
target_link_libraries(project_target PRIVATE ALSA::ALSA)
```

### FindArmadillo
Finds the Armadillo C++ library:

```
find_package(Armadillo [<version>] [...])
```

Armadillo is a library for linear algebra and scientific computing.

Added in version 3.18: Support for linking wrapped libraries directly (see the ARMA_DONT_USE_WRAPPER preprocessor macro that needs to be defined before including the <armadillo> header).

### Result Variables
This module defines the following variables:

Armadillo_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Armadillo library was found.

Armadillo_VERSION

Added in version 4.2.

The version of Armadillo found (e.g., 14.90.0).

Armadillo_VERSION_NAME

Added in version 4.2.

The version name of Armadillo found (e.g., Antipodean Antileech).

ARMADILLO_INCLUDE_DIRS

List of required include directories.

ARMADILLO_LIBRARIES

List of libraries to be linked.

### Deprecated Variables
The following variables are provided for backward compatibility:

ARMADILLO_FOUND

Deprecated since version 4.2: Use Armadillo_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Armadillo library was found.

ARMADILLO_VERSION_STRING

Deprecated since version 4.2: Superseded by the Armadillo_VERSION.

The version of Armadillo found.

ARMADILLO_VERSION_MAJOR

Deprecated since version 4.2: Superseded by the Armadillo_VERSION.

Major version number.

ARMADILLO_VERSION_MINOR

Deprecated since version 4.2: Superseded by the Armadillo_VERSION.

Minor version number.

ARMADILLO_VERSION_PATCH

Deprecated since version 4.2: Superseded by the Armadillo_VERSION.

Patch version number.

ARMADILLO_VERSION_NAME

Deprecated since version 4.2: Superseded by the Armadillo_VERSION_NAME.

The version name of Armadillo found (e.g., Antipodean Antileech).

### Examples
Finding Armadillo and creating an imported target:

```
find_package(Armadillo REQUIRED)
if(Armadillo_FOUND AND NOT TARGET Armadillo::Armadillo)

  add_library(Armadillo::Armadillo INTERFACE IMPORTED)

  set_target_properties(

    Armadillo::Armadillo

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${ARMADILLO_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${ARMADILLO_INCLUDE_DIRS}"

  )
endif()
add_executable(foo foo.cc)
target_link_libraries(foo PRIVATE Armadillo::Armadillo)
```

### FindASPELL
Finds the GNU Aspell spell checker library:

```
find_package(ASPELL [<version>] [COMPONENTS <components>] [...])
```

### Components
This module supports optional components which can be specified using the find_package() <#command:find_package> command:

```
find_package(ASPELL [COMPONENTS <components>...])
```

Supported components include:

ASPELL

Added in version 4.1.

Finds the Aspell library and its include paths.

Executable

Added in version 4.1.

Finds the Aspell command-line interactive spell checker executable.

If no components are specified, the module searches for both the ASPELL and Executable components by default.

### Imported Targets
This module provides the following Imported Targets <#imported-targets> when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT:

ASPELL::ASPELL

Added in version 4.1.

Target encapsulating the Aspell library usage requirements. It is available only when the ASPELL component is found.

ASPELL::Executable

Added in version 4.1.

Target encapsulating the Aspell command-line spell checker executable. It is available only when the Executable component is found.

### Result Variables
This module defines the following variables:

ASPELL_FOUND

Boolean indicating whether (the requested version of) Aspell and all requested components were found.

ASPELL_VERSION

Added in version 4.1.

Version string of the found Aspell if any. It may be only determined if the Executable component is found. If version isn't determined, version value is not set.

ASPELL_INCLUDE_DIRS

Added in version 4.1.

Include directories needed to use Aspell. They are available when the ASPELL component is found.

The Aspell library may also provide a backward-compatible interface for Pspell via the pspell.h header file. If such an interface is found, it is also added to the list of include directories.

ASPELL_LIBRARIES

Libraries needed to link to Aspell. They are available when the ASPELL component is found. Changed in version 4.1: This variable is now set as a regular result variable instead of being a cache variable.

### Cache Variables
The following cache variables may also be set:

ASPELL_INCLUDE_DIR

The directory containing the aspell.h header file when using the Executable component.

ASPELL_LIBRARY

Added in version 4.1.

The path to the Aspell library when using the ASPELL component.

ASPELL_EXECUTABLE

The path to the aspell command-line spell checker program when using the Executable component.

### Examples
Finding the Aspell library with CMake 4.1 or later and linking it to a project target:

```
find_package(ASPELL COMPONENTS ASPELL)
target_link_libraries(project_target PRIVATE ASPELL::ASPELL)
```

When writing backward-compatible code that supports CMake 4.0 and earlier, a local imported target can be defined directly in the project:

```
find_package(ASPELL COMPONENTS ASPELL)
if(ASPELL_FOUND AND NOT TARGET ASPELL::ASPELL)

  add_library(ASPELL::ASPELL INTERFACE IMPORTED)

  set_target_properties(

    ASPELL::ASPELL

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${ASPELL_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${ASPELL_INCLUDE_DIR}"

  )
endif()
target_link_libraries(project_target PRIVATE ASPELL::ASPELL)
```

Example, how to execute the aspell command-line spell checker in a project:

```
find_package(ASPELL COMPONENTS Executable)
execute_process(COMMAND ${ASPELL_EXECUTABLE} --help)
```

### FindAVIFile
Finds AVIFile <https://avifile.sourceforge.net/> library and include paths:

```
find_package(AVIFile [...])
```

AVIFile is a set of libraries for i386 machines to use various AVI codecs. Support is limited beyond Linux. Windows provides native AVI support, and so doesn't need this library.

### Result Variables
This module defines the following variables:

AVIFile_FOUND

Added in version 3.3.

Boolean indicating whether AVIFile was found.

AVIFILE_LIBRARIES

The libraries to link against.

AVIFILE_DEFINITIONS

Definitions to use when compiling.

### Cache Variables
The following cache variables may also be set:

AVIFILE_INCLUDE_DIR

Directory containing avifile.h and other AVIFile headers.

### Deprecated Variables
The following variables are provided for backward compatibility:

AVIFILE_FOUND

Deprecated since version 4.2: Use AVIFile_FOUND, which has the same value.

Boolean indicating whether AVIFile was found.

### Examples
Finding AVIFile and conditionally creating an interface Imported Target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(AVIFile)
if(AVIFile_FOUND AND NOT TARGET AVIFile::AVIFile)

  add_library(AVIFile::AVIFile INTERFACE IMPORTED)

  set_target_properties(

    AVIFile::AVIFile

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${AVIFILE_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${AVIFILE_LIBRARIES}"

      INTERFACE_COMPILE_DEFINITIONS "${AVIFILE_DEFINITIONS}"

  )
endif()
target_link_libraries(example PRIVATE AVIFile::AVIFile)
```

### FindBacktrace
Finds backtrace(3) <https://man7.org/linux/man-pages/man3/backtrace.3.html>, a library that provides functions for application self-debugging:

```
find_package(Backtrace [...])
```

This module checks whether backtrace(3) is supported, either through the standard C library (libc), or a separate library.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Backtrace::Backtrace

Added in version 3.30.

An interface library encapsulating the usage requirements of Backtrace. This target is available only when Backtrace is found.

### Result Variables
This module defines the following variables:

Backtrace_FOUND

Boolean indicating whether the backtrace(3) support is available.

Backtrace_INCLUDE_DIRS

The include directories needed to use backtrace(3) header.

Backtrace_LIBRARIES

The libraries (linker flags) needed to use backtrace(3), if any.

### Cache Variables
The following cache variables are also available to set or use:

Backtrace_HEADER

The header file needed for backtrace(3). This variable allows dynamic usage of the header in the project code. It can also be overridden by the user.

Backtrace_INCLUDE_DIR

The directory holding the backtrace(3) header.

Backtrace_LIBRARY

The external library providing backtrace, if any.

### Examples
Finding Backtrace and linking it to a project target as of CMake 3.30:

CMakeLists.txt

```
find_package(Backtrace)
target_link_libraries(app PRIVATE Backtrace::Backtrace)
```

The Backtrace_HEADER variable can be used, for example, in a configuration header file created by configure_file() <#command:configure_file>:

CMakeLists.txt

```
add_library(app app.c)
find_package(Backtrace)
target_link_libraries(app PRIVATE Backtrace::Backtrace)
configure_file(config.h.in config.h)
```

config.h.in

```
#cmakedefine01 Backtrace_FOUND
#if Backtrace_FOUND
#  include <@Backtrace_HEADER@>
#endif
```

app.c

```
#include "config.h"
```

If the project needs to support CMake 3.29 or earlier, the imported target can be defined manually:

CMakeLists.txt

```
find_package(Backtrace)
if(Backtrace_FOUND AND NOT TARGET Backtrace::Backtrace)

  add_library(Backtrace::Backtrace INTERFACE IMPORTED)

  set_target_properties(

    Backtrace::Backtrace

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${Backtrace_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${Backtrace_INCLUDE_DIRS}"

  )
endif()
target_link_libraries(app PRIVATE Backtrace::Backtrace)
```

### FindBISON
Finds the Bison command-line parser generator and provides a CMake command to generate custom build rules for using Bison:

```
find_package(BISON [<version>] [...])
```

Bison is a parser generator that replaced earlier Yacc (Yet Another Compiler-Compiler). On Unix-like systems, most common implementation is GNU Bison. On Windows, this module looks for Windows-compatible Bison, if installed.

### Result Variables
This module defines the following variables:

BISON_FOUND

Boolean indicating whether (the requested version of) Bison was found.

BISON_VERSION

The version of Bison found.

### Cache Variables
The following cache variables may also be set:

BISON_EXECUTABLE

The path to the bison command-line program.

### Commands
This module provides the following command if bison is found:

bison_target

Creates a custom build rule to generate a parser file from a Yacc file using Bison:

```
bison_target(

  <name>

  <input-yacc-file>

  <output-parser-file>

  [DEFINES_FILE <header>]

  [VERBOSE [<file>]]       # The [<file>] argument is deprecated

  [REPORT_FILE <file>]

  [OPTIONS <options>...]

  [COMPILE_FLAGS <string>] # Deprecated
)
```

Changed in version 3.14: When policy CMP0088 <#policy:CMP0088> is set to NEW, bison runs in the CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> directory.

<name>

String used as an identifier for this command invocation.

<input-yacc-file>

The path to an input Yacc source file (.y). If given as a relative path, it will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

<output-parser-file>

The path of the output parser file to be generated by Bison. If given as a relative path, it will be interpreted relative to the current Bison working directory.

DEFINES_FILE <header>

Added in version 3.4.

By default, Bison can generate a header file containing the list of tokens. This option allows specifying a custom <header> file to be generated by Bison. If given as a relative path, it will be interpreted relative to the current Bison working directory.

VERBOSE [<file>]

Enables generation of a verbose grammar and parser report. By default, the report file is created in the current Bison working directory and named <output-parser-filename>.output.

<file>

Deprecated since version 3.7: Use VERBOSE REPORT_FILE <file>.

Specifies the path to which the report file should be copied. This argument is retained for backward compatibility and only works when the <output-parser-file> is specified as an absolute path.

REPORT_FILE <file>

Added in version 3.7.

Used in combination with VERBOSE to specify a custom path for the report output <file>, overriding the default location. If given as a relative path, it will be interpreted relative to the current Bison working directory.

OPTIONS <options>...

Added in version 4.0.

A semicolon-separated list <#cmake-language-lists> of extra options added to the bison command line.

COMPILE_FLAGS <string>

Deprecated since version 4.0: Superseded by OPTIONS <options>....

A string of space-separated extra options added to the bison command line. A semicolon-separated list <#cmake-language-lists> will not work.

Command variables

This command also defines the following variables:

BISON_<name>_DEFINED

Boolean indicating whether this command was successfully invoked.

BISON_<name>_INPUT

The input source file, an alias for <input-yacc-file>.

BISON_<name>_OUTPUT_SOURCE

The output parser file generated by bison.

BISON_<name>_OUTPUT_HEADER

The header file generated by bison, if any.

BISON_<name>_OUTPUTS

A list of files generated by bison, including the output parser file, header file, and report file.

BISON_<name>_OPTIONS

Added in version 4.0.

A list of command-line options used for the bison command.

BISON_<name>_COMPILE_FLAGS

Deprecated since version 4.0: Superseded by BISON_<name>_OPTIONS variable with the same value.

A list of command-line options used for the bison command.

### Examples: Finding Bison
Finding Bison:

```
find_package(BISON)
```

Finding Bison with a minimum required version:

```
find_package(BISON 2.1.3)
```

Finding Bison and making it required (if Bison is not found, processing stops with an error message):

```
find_package(BISON 2.1.3 REQUIRED)
```

### Example: Generating Parser
Finding Bison and adding input Yacc source file parser.y to be processed by Bison into parser.cpp source file with header parser.h at build phase:

```
find_package(BISON)
if(BISON_FOUND)

  bison_target(MyParser parser.y parser.cpp DEFINES_FILE parser.h)
endif()
add_executable(Foo main.cpp ${BISON_MyParser_OUTPUTS})
```

### Examples: Command-line Options
Adding additional command-line options to the bison executable can be passed as a list. For example, adding the -Wall option to report all warnings, and --no-lines (-l) to not generate #line directives:

```
find_package(BISON)
if(BISON_FOUND)

  bison_target(MyParser parser.y parser.cpp OPTIONS -Wall --no-lines)
endif()
```

Generator expressions <#manual:cmake-generator-expressions(7)> can be used in the OPTIONS <options>... argument. For example, to add the --debug (-t) option only for the Debug build type:

```
find_package(BISON)
if(BISON_FOUND)

  bison_target(MyParser parser.y parser.cpp OPTIONS $<$<CONFIG:Debug>:-t>)
endif()
```

### See Also
•

The FindFLEX <#module:FindFLEX> module to find Flex scanner generator.

### FindBLAS
Finds the installed Basic Linear Algebra Subprograms (BLAS) Fortran library, which implements the BLAS linear-algebra interface <https://netlib.org/blas/>:

```
find_package(BLAS [...])
```

At least one of the C, CXX, or Fortran languages must be enabled.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

BLAS::BLAS

Added in version 3.18.

Target encapsulating the libraries and usage requirements to use BLAS, available only if BLAS is found.

### Result Variables
This module defines the following variables:

BLAS_FOUND

Boolean indicating whether the library implementing the BLAS interface was found.

BLAS_LINKER_FLAGS

Uncached list of required linker flags (excluding -l and -L).

BLAS_LIBRARIES

Uncached list of libraries (using full path name) to link against to use BLAS (may be empty if compiler implicitly links BLAS).

BLAS95_LIBRARIES

Uncached list of libraries (using full path name) to link against to use BLAS95 interface.

BLAS95_FOUND

Boolean indicating whether the library implementing the BLAS95 interface was found.

### Input Variables
The following variables may be set to influence this module's behavior:

BLA_STATIC

If ON, the static linkage will be used.

BLA_VENDOR

Set to one of the BLAS/LAPACK Vendors to search for BLAS only from the specified vendor. If not set, all vendors are considered.

BLA_F95

If ON, the module tries to find the BLAS95 interfaces.

BLA_PREFER_PKGCONFIG

Added in version 3.11.

If set, pkg-config will be used to search for a BLAS library first and if one is found that is preferred

BLA_PKGCONFIG_BLAS

Added in version 3.25.

If set, the pkg-config method will look for this module name instead of just blas.

BLA_SIZEOF_INTEGER

Added in version 3.22.

Specify the BLAS/LAPACK library integer size:

4

Search for a BLAS/LAPACK with 32-bit integer interfaces.

8

Search for a BLAS/LAPACK with 64-bit integer interfaces.

ANY

Search for any BLAS/LAPACK. Most likely, a BLAS/LAPACK with 32-bit integer interfaces will be found.

BLA_THREAD

Added in version 4.1.

Specify the BLAS/LAPACK threading model:

SEQ

Sequential model

OMP

OpenMP model

ANY

Search for any BLAS/LAPACK, if both are available most likely OMP will be found.

This is currently only supported by NVIDIA NVPL.

### BLAS/LAPACK Vendors
Generic

Generic reference implementation.

ACML, ACML_MP, ACML_GPU

AMD Core Math Library

AOCL, AOCL_mt

Added in version 3.27.

AMD Optimizing CPU Libraries.

Apple, NAS

Apple BLAS (Accelerate), and Apple NAS (vecLib).

Arm, Arm_mp, Arm_ilp64, Arm_ilp64_mp

Added in version 3.18.

Arm Performance Libraries.

ATLAS

Automatically Tuned Linear Algebra Software.

CXML, DXML

Compaq/Digital Extended Math Library.

EML, EML_mt

Added in version 3.20.

Elbrus Math Library.

FLAME

Added in version 3.11.

BLIS Framework.

FlexiBLAS

Added in version 3.19.

Fujitsu_SSL2, Fujitsu_SSL2BLAMP, Fujitsu_SSL2SVE, Fujitsu_SSL2BLAMPSVE

Added in version 3.20.

Fujitsu SSL2 serial and parallel blas/lapack with SVE instructions.

Goto

GotoBLAS.

IBMESSL, IBMESSL_SMP

IBM Engineering and Scientific Subroutine Library.

Intel

Intel MKL 32 bit and 64 bit obsolete versions.

Intel10_32

Intel MKL v10 32 bit, threaded code.

Intel10_64lp

Intel MKL v10+ 64 bit, threaded code, lp64 model.

Intel10_64lp_seq

Intel MKL v10+ 64 bit, sequential code, lp64 model.

Intel10_64ilp

Added in version 3.13.

Intel MKL v10+ 64 bit, threaded code, ilp64 model.

Intel10_64ilp_seq

Added in version 3.13.

Intel MKL v10+ 64 bit, sequential code, ilp64 model.

Intel10_64_dyn

Added in version 3.17.

Intel MKL v10+ 64 bit, single dynamic library.

libblastrampoline

Added in version 3.30.

A BLAS/LAPACK demuxing library using PLT trampolines.

NVPL

Added in version 4.1.

NVIDIA Performance Libraries.

NVHPC

Added in version 3.21.

NVIDIA HPC SDK.

OpenBLAS

Added in version 3.6.

PhiPACK

Portable High Performance ANSI C (PHiPAC).

SCSL, SCSL_mp

Scientific Computing Software Library.

SGIMATH

SGI Scientific Mathematical Library.

SunPerf

Sun Performance Library.

### Intel MKL
To use the Intel MKL implementation of BLAS, a project must enable at least one of the C or CXX languages. Set BLA_VENDOR to an Intel MKL variant either on the command-line as -DBLA_VENDOR=Intel10_64lp or in project code:

```
set(BLA_VENDOR Intel10_64lp)
find_package(BLAS)
```

In order to build a project using Intel MKL, and end user must first establish an Intel MKL environment:

Intel oneAPI

Source the full Intel environment script:

```
. /opt/intel/oneapi/setvars.sh
```

Or, source the MKL component environment script:

```
. /opt/intel/oneapi/mkl/latest/env/vars.sh
```

Intel Classic

Source the full Intel environment script:

```
. /opt/intel/bin/compilervars.sh intel64
```

Or, source the MKL component environment script:

```
. /opt/intel/mkl/bin/mklvars.sh intel64
```

The above environment scripts set the MKLROOT environment variable to the top of the MKL installation. They also add the location of the runtime libraries to the dynamic library loader environment variable for your platform (e.g. LD_LIBRARY_PATH). This is necessary for programs linked against MKL to run.

Note:

As of Intel oneAPI 2021.2, loading only the MKL component does not make all of its dependencies available. In particular, the iomp5 library must be available separately, or provided by also loading the compiler component environment:

```
. /opt/intel/oneapi/compiler/latest/env/vars.sh
```

### Examples
Finding BLAS and linking it to a project target:

```
find_package(BLAS)
target_link_libraries(example PRIVATE BLAS::BLAS)
```

### FindBullet
Finds the Bullet physics engine:

```
find_package(Bullet [...])
```

### Result Variables
This module defines the following variables:

Bullet_FOUND

Added in version 3.3.

Boolean indicating whether Bullet was found.

BULLET_INCLUDE_DIRS

The Bullet include directories.

BULLET_LIBRARIES

Libraries needed to link to Bullet. By default, all Bullet components (Dynamics, Collision, LinearMath, and SoftBody) are added.

### Hints
This module accepts the following variables:

BULLET_ROOT

Can be set to Bullet install path or Windows build path to specify where to find Bullet.

### Deprecated Variables
The following variables are provided for backward compatibility:

BULLET_FOUND

Deprecated since version 4.2: Use Bullet_FOUND, which has the same value.

Boolean indicating whether Bullet was found.

### Examples
Finding Bullet and conditionally creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Bullet)
if(Bullet_FOUND AND NOT TARGET Bullet::Bullet)

  add_library(Bullet::Bullet INTERFACE IMPORTED)

  set_target_properties(

    Bullet::Bullet

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${BULLET_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${BULLET_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE Bullet::Bullet)
```

### FindBZip2
Finds the BZip2 data compression library (libbz2):

```
find_package(BZip2 [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

BZip2::BZip2

Added in version 3.12.

Target encapsulating the usage requirements of BZip2 library. This target is available only when BZip2 is found.

### Result Variables
This module defines the following variables:

BZip2_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) BZip2 library was found.

BZip2_VERSION

Added in version 4.2.

The version of BZip2 found.

BZIP2_INCLUDE_DIRS

Added in version 3.12.

Include directories needed to use BZip2 library.

BZIP2_LIBRARIES

Libraries needed for linking to use BZip2.

### Cache Variables
The following cache variables may also be set:

BZIP2_INCLUDE_DIR

The directory containing the BZip2 headers.

BZIP2_LIBRARY_RELEASE

The path to the BZip2 library for release configurations.

BZIP2_LIBRARY_DEBUG

The path to the BZip2 library for debug configurations.

BZIP2_NEED_PREFIX

Boolean indicating whether BZip2 functions are prefixed with BZ2_ (e.g., BZ2_bzCompressInit()). Versions of BZip2 prior to 1.0.0 used unprefixed function names (e.g., bzCompressInit()).

### Deprecated Variables
The following variables are provided for backward compatibility:

BZIP2_FOUND

Deprecated since version 4.2: Use BZip2_FOUND, which has the same value.

Boolean indicating whether the (requested version of) BZip2 library was found.

BZIP2_VERSION_STRING

Deprecated since version 3.26: Superseded by the BZIP2_VERSION (and BZip2_VERSION).

The version of BZip2 found.

BZIP2_VERSION

Added in version 3.26.

Deprecated since version 4.2: Superseded by the BZip2_VERSION.

The version of BZip2 found.

### Examples
Finding BZip2 library and linking it to a project target:

```
find_package(BZip2)
target_link_libraries(project_target PRIVATE BZip2::BZip2)
```

### FindCoin3D
Finds Coin3D (Open Inventor):

```
find_package(Coin3D [...])
```

Coin3D is an implementation of the Open Inventor API. It provides data structures and algorithms for 3D visualization.

### Result Variables
This module defines the following variables:

Coin3D_FOUND

Added in version 3.3.

Boolean indicating whether Coin3D, Open Inventor was found.

### Cache Variables
The following cache variables may also be set:

COIN3D_INCLUDE_DIRS

Directory containing the Open Inventor header files (Inventor/So.h).

COIN3D_LIBRARIES

Coin3D libraries required for linking.

### Deprecated Variables
The following variables are provided for backward compatibility:

COIN3D_FOUND

Deprecated since version 4.2: Use Coin3D_FOUND, which has the same value.

Boolean indicating whether Coin3D, Open Inventor was found.

### Examples
Finding Coin3D and conditionally creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Coin3D)
if(Coin3D_FOUND AND NOT TARGET Coin3D::Coin3D)

  add_library(Coin3D::Coin3D INTERFACE IMPORTED)

  set_target_properties(

    Coin3D::Coin3D

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${COIN3D_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${COIN3D_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE Coin3D::Coin3D)
```

### FindCUDAToolkit
Added in version 3.17.

Finds the NVIDIA CUDA toolkit and the associated libraries, but does not require the CUDA language be enabled for a given project:

```
find_package(CUDAToolkit [<version>] [QUIET] [REQUIRED] [EXACT] [...])
```

This module does not search for the NVIDIA CUDA Samples.

Added in version 3.19: QNX support.

### Search Behavior
The CUDA Toolkit search behavior uses the following order:

1.

If the CUDA language has been enabled we will use the directory containing the compiler as the first search location for nvcc.

2.

If the variable CMAKE_CUDA_COMPILER <#variable:CMAKE_<LANG>_COMPILER> or the environment variable CUDACXX <#envvar:CUDACXX> is defined, it will be used as the path to the nvcc executable.

3.

If the CUDAToolkit_ROOT cmake configuration variable (e.g., -DCUDAToolkit_ROOT=/some/path) or environment variable is defined, it will be searched. If both an environment variable and a configuration variable are specified, the configuration variable takes precedence. The directory specified here must be such that the executable nvcc or the appropriate version.txt or version.json file can be found underneath the specified directory.

4.

If the CUDA_PATH environment variable is defined, it will be searched for nvcc.

5.

The user's path is searched for nvcc using find_program() <#command:find_program>. If this is found, no subsequent search attempts are performed. Users are responsible for ensuring that the first nvcc to show up in the path is the desired path in the event that multiple CUDA Toolkits are installed.

6.

On Unix systems, if the symbolic link /usr/local/cuda exists, this is used. No subsequent search attempts are performed. No default symbolic link location exists for the Windows platform.

7.

The platform specific default install locations are searched. If exactly one candidate is found, this is used. The default CUDA Toolkit install locations searched are: Platform

Search Pattern

macOS

/Developer/NVIDIA/CUDA-X.Y

Other Unix

/usr/local/cuda-X.Y

Windows

C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\vX.Y

Where X.Y would be a specific version of the CUDA Toolkit, such as /usr/local/cuda-9.0 or C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0

Note:

When multiple CUDA Toolkits are installed in the default location of a system (e.g., both /usr/local/cuda-9.0 and /usr/local/cuda-10.0 exist but the /usr/local/cuda symbolic link does not exist), this package is marked as not found. There are too many factors involved in making an automatic decision in the presence of multiple CUDA Toolkits being installed. In this situation, users are encouraged to either (1) set CUDAToolkit_ROOT or (2) ensure that the correct nvcc executable shows up in $PATH for find_program() <#command:find_program> to find.

### Arguments
[<version>]

The [<version>] argument requests a version with which the package found should be compatible. See find_package version format <#find-package-version-format> for more details.

### Options
REQUIRED

If specified, configuration will error if a suitable CUDA Toolkit is not found.

QUIET

If specified, the search for a suitable CUDA Toolkit will not produce any messages.

EXACT

If specified, the CUDA Toolkit is considered found only if the exact VERSION specified is recovered.

### Imported Targets
An imported target <#imported-targets> named CUDA::toolkit is provided.

This module provides Imported Targets <#imported-targets> for each of the following libraries that are part of the CUDAToolkit:

- CUDA Runtime Library

- CUDA Driver Library

- cuBLAS

- cuDLA

- cuFile

- cuFFT

- cuRAND

- cuSOLVER

- cuSPARSE

- cuPTI

- NPP

- nvBLAS

- nvGRAPH

- nvJPEG

- nvidia-ML

- nvPTX Compiler

- nvRTC

- nvJitLink

- nvFatBin

- nvToolsExt

- nvtx3

- OpenCL

- cuLIBOS

### CUDA Runtime Library
The CUDA Runtime library (cudart) are what most applications will typically need to link against to make any calls such as cudaMalloc, and cudaFree.

Targets Created:

- CUDA::cudart

- CUDA::cudart_static

### CUDA Driver Library
The CUDA Driver library (cuda) are used by applications that use calls such as cuMemAlloc, and cuMemFree.

Targets Created:

•

CUDA::cuda_driver

### cuBLAS
The CUDA Basic Linear Algebra Subroutine <https://docs.nvidia.com/cuda/cublas> library.

Targets Created:

- CUDA::cublas

- CUDA::cublas_static

- CUDA::cublasLt starting in CUDA 10.1

- CUDA::cublasLt_static starting in CUDA 10.1

### cuDLA
Added in version 3.27.

The NVIDIA Tegra Deep Learning Accelerator <https://docs.nvidia.com/cuda/cuda-for-tegra-appnote#cudla> library.

Targets Created:

•

CUDA::cudla starting in CUDA 11.6

### cuFile
Added in version 3.25.

The NVIDIA GPUDirect Storage cuFile <https://docs.nvidia.com/gpudirect-storage/api-reference-guide> library.

Targets Created:

- CUDA::cuFile starting in CUDA 11.4

- CUDA::cuFile_static starting in CUDA 11.4

- CUDA::cuFile_rdma starting in CUDA 11.4

- CUDA::cuFile_rdma_static starting in CUDA 11.4

### cuFFT
The CUDA Fast Fourier Transform <https://docs.nvidia.com/cuda/cufft> library.

Targets Created:

- CUDA::cufft

- CUDA::cufftw

- CUDA::cufft_static

- CUDA::cufft_static_nocallback starting in CUDA 9.2, requires CMake 3.23+

- CUDA::cufftw_static

### cuRAND
The CUDA random number generation <https://docs.nvidia.com/cuda/curand> library.

Targets Created:

- CUDA::curand

- CUDA::curand_static

### cuSOLVER
A GPU accelerated linear system solver <https://docs.nvidia.com/cuda/cusolver> library.

Targets Created:

- CUDA::cusolver

- CUDA::cusolver_static

### cuSPARSE
The CUDA sparse matrix <https://docs.nvidia.com/cuda/cusparse> library.

Targets Created:

- CUDA::cusparse

- CUDA::cusparse_static

### cupti
The NVIDIA CUDA Profiling Tools Interface <https://developer.nvidia.com/cupti>.

Targets Created:

- CUDA::cupti

- CUDA::cupti_static

Added in version 3.27:

- CUDA::nvperf_host starting in CUDA 10.2

- CUDA::nvperf_host_static starting in CUDA 10.2

- CUDA::nvperf_target starting in CUDA 10.2

- CUDA::pcsamplingutil starting in CUDA 11.3

### NPP
The NVIDIA 2D Image and Signal Processing Performance Primitives <https://docs.nvidia.com/cuda/npp> libraries.

Targets Created:

•

nppc:

- CUDA::nppc

- CUDA::nppc_static

•

nppial: Arithmetic and logical operation functions in nppi_arithmetic_and_logical_operations.h

- CUDA::nppial

- CUDA::nppial_static

•

nppicc: Color conversion and sampling functions in nppi_color_conversion.h

- CUDA::nppicc

- CUDA::nppicc_static

•

nppicom: JPEG compression and decompression functions in nppi_compression_functions.h Removed starting in CUDA 11.0, use nvJPEG instead.

- CUDA::nppicom

- CUDA::nppicom_static

•

nppidei: Data exchange and initialization functions in nppi_data_exchange_and_initialization.h

- CUDA::nppidei

- CUDA::nppidei_static

•

nppif: Filtering and computer vision functions in nppi_filter_functions.h

- CUDA::nppif

- CUDA::nppif_static

•

nppig: Geometry transformation functions found in nppi_geometry_transforms.h

- CUDA::nppig

- CUDA::nppig_static

•

nppim: Morphological operation functions found in nppi_morphological_operations.h

- CUDA::nppim

- CUDA::nppim_static

•

nppist: Statistics and linear transform in nppi_statistics_functions.h and nppi_linear_transforms.h

- CUDA::nppist

- CUDA::nppist_static

•

nppisu: Memory support functions in nppi_support_functions.h

- CUDA::nppisu

- CUDA::nppisu_static

•

nppitc: Threshold and compare operation functions in nppi_threshold_and_compare_operations.h

- CUDA::nppitc

- CUDA::nppitc_static

•

npps:

- CUDA::npps

- CUDA::npps_static

### nvBLAS
The GPU-accelerated drop-in BLAS <https://docs.nvidia.com/cuda/nvblas> library. This is a shared library only.

Targets Created:

•

CUDA::nvblas

### nvGRAPH
A GPU-accelerated graph analytics <https://docs.nvidia.com/cuda/archive/10.0/nvgraph> library. Removed starting in CUDA 11.0

Targets Created:

- CUDA::nvgraph

- CUDA::nvgraph_static

### nvJPEG
A GPU-accelerated JPEG codec <https://docs.nvidia.com/cuda/nvjpeg> library. Introduced in CUDA 10.

Targets Created:

- CUDA::nvjpeg

- CUDA::nvjpeg_static

### nvPTX Compiler
Added in version 3.25.

The PTX Compiler APIs <https://docs.nvidia.com/cuda/ptx-compiler-api>. These are a set of APIs which can be used to compile a PTX program into GPU assembly code. Introduced in CUDA 11.1 This is a static library only.

Targets Created:

•

CUDA::nvptxcompiler_static starting in CUDA 11.1

### nvRTC
A runtime compilation library for CUDA <https://docs.nvidia.com/cuda/nvrtc>.

Targets Created:

•

CUDA::nvrtc

Added in version 3.26:

- CUDA::nvrtc_builtins

- CUDA::nvrtc_static starting in CUDA 11.5

- CUDA::nvrtc_builtins_static starting in CUDA 11.5

### nvJitLink
The JIT Link APIs <https://docs.nvidia.com/cuda/nvjitlink>.

Targets Created:

- CUDA::nvJitLink starting in CUDA 12.0

- CUDA::nvJitLink_static starting in CUDA 12.0

### nvFatBin
Added in version 3.30.

The Fatbin Creator APIs <https://docs.nvidia.com/cuda/nvfatbin>.

Targets Created:

- CUDA::nvfatbin starting in CUDA 12.4

- CUDA::nvfatbin_static starting in CUDA 12.4

### nvidia-ML
The NVIDIA Management Library <https://developer.nvidia.com/management-library-nvml>.

Targets Created:

- CUDA::nvml

- CUDA::nvml_static starting in CUDA 12.4

Added in version 3.31: Added CUDA::nvml_static.

### nvToolsExt
Deprecated since version 3.25: With CUDA 10.0+, use nvtx3. Starting in CUDA 12.9 the nvToolsExt library no longer exists

The legacy NVIDIA Tools Extension <https://docs.nvidia.com/cuda/archive/9.0/profiler-users-guide#nvtx>. This is a shared library only.

Targets Created:

•

CUDA::nvToolsExt

### nvtx3
Added in version 3.25.

The header-only NVIDIA Tools Extension <https://nvidia.github.io/NVTX/doxygen> library. Introduced in CUDA 10.0.

Targets created:

- CUDA::nvtx3

- CUDA::nvtx3_interop Added in version 4.1.

This is provided by CUDA 12.9 and above for use by languages that cannot consume C++ header-only libraries, such as Fortran.

### OpenCL
The NVIDIA Open Computing Language <https://developer.nvidia.com/opencl> library. This is a shared library only.

Targets Created:

•

CUDA::OpenCL

### cuLIBOS
The cuLIBOS library is a backend thread abstraction layer library which is static only. The CUDA::cublas_static, CUDA::cusparse_static, CUDA::cufft_static, CUDA::curand_static, and (when implemented) NPP libraries all automatically have this dependency linked.

Target Created:

•

CUDA::culibos

Note: direct usage of this target by consumers should not be necessary.

### bin2c
Added in version 4.3.

A utility that converts binary files to C files containing byte arrays.

Target Created:

•

CUDA::bin2c

### Result Variables
This module defines the following variables:

CUDAToolkit_FOUND

A boolean specifying whether or not the CUDA Toolkit was found.

CUDAToolkit_VERSION

The exact version of the CUDA Toolkit found (as reported by nvcc --version, version.txt, or version.json).

CUDAToolkit_VERSION_MAJOR

The major version of the CUDA Toolkit.

CUDAToolkit_VERSION_MINOR

The minor version of the CUDA Toolkit.

CUDAToolkit_VERSION_PATCH

The patch version of the CUDA Toolkit.

CUDAToolkit_BIN_DIR

The path to the CUDA Toolkit library directory that contains the CUDA executable nvcc.

CUDAToolkit_INCLUDE_DIRS

List of paths to all the CUDA Toolkit folders containing header files required to compile a project linking against CUDA.

CUDAToolkit_LIBRARY_DIR

The path to the CUDA Toolkit library directory that contains the CUDA Runtime library cudart.

CUDAToolkit_LIBRARY_ROOT

Added in version 3.18.

The path to the CUDA Toolkit directory containing the nvvm directory and either version.txt or version.json.

CUDAToolkit_TARGET_DIR

The path to the CUDA Toolkit directory including the target architecture when cross-compiling. When not cross-compiling this will be equivalent to the parent directory of CUDAToolkit_BIN_DIR.

CUDAToolkit_NVCC_EXECUTABLE

The path to the NVIDIA CUDA compiler nvcc. Note that this path may not be the same as CMAKE_CUDA_COMPILER <#variable:CMAKE_<LANG>_COMPILER>. nvcc must be found to determine the CUDA Toolkit version as well as determining other features of the Toolkit. This variable is set for the convenience of modules that depend on this one.

### FindCups
Finds the Common UNIX Printing System (CUPS):

```
find_package(Cups [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Cups::Cups

Added in version 3.15.

Target encapsulating the CUPS usage requirements, available only if CUPS is found.

### Result Variables
This module defines the following variables:

Cups_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) CUPS was found.

Cups_VERSION

Added in version 4.2.

The version of CUPS found.

CUPS_INCLUDE_DIRS

Include directories needed for using CUPS.

### Cache Variables
The following cache variables may also be set:

CUPS_INCLUDE_DIR

The directory containing the CUPS headers.

CUPS_LIBRARIES

Libraries needed to link against to use CUPS.

### Hints
This module accepts the following variables:

CUPS_REQUIRE_IPP_DELETE_ATTRIBUTE

Set this variable to TRUE to require CUPS version which features the ippDeleteAttribute() function (i.e. at least of CUPS 1.1.19).

### Deprecated Variables
The following variables are provided for backward compatibility:

CUPS_FOUND

Deprecated since version 4.2: Use Cups_FOUND, which has the same value.

Boolean indicating whether (the requested version of) CUPS was found.

CUPS_VERSION_STRING

Deprecated since version 4.2: Superseded by the Cups_VERSION.

The version of CUPS found.

### Examples
Finding CUPS and linking it to a project target:

```
find_package(Cups)
target_link_libraries(project_target PRIVATE Cups::Cups)
```

### FindCURL
Finds the native curl installation (include directories and libraries) for transferring data with URLS:

```
find_package(CURL [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.17: If curl is built using its CMake-based build system, it will provide its own CMake Package Configuration file (CURLConfig.cmake) for use with the find_package() <#command:find_package> command in config mode. By default, this module searches for this file and, if found, returns the results without further action. If the upstream configuration file is not found, this module falls back to module mode and searches standard locations.

Added in version 3.13: Debug and Release library variants are found separately.

### Components
Added in version 3.14.

This module supports optional components to detect the protocols and features available in the installed curl (these can vary based on the curl version):

```
Protocols: DICT FILE FTP FTPS GOPHER GOPHERS HTTP HTTPS IMAP IMAPS IPFS IPNS

           LDAP LDAPS MQTT POP3 POP3S RTMP RTMPS RTSP SCP SFTP SMB SMBS SMTP

           SMTPS TELNET TFTP WS WSS
Features:  alt-svc asyn-rr AsynchDNS brotli CAcert Debug ECH gsasl GSS-API

           HSTS HTTP2 HTTP3 HTTPS-proxy HTTPSRR IDN IPv6 Kerberos Largefile

           libz MultiSSL NTLM NTLM_WB PSL SPNEGO SSL SSLS-EXPORT SSPI

           threadsafe TLS-SRP TrackMemory Unicode UnixSockets zstd
```

Components can be specified with the find_package() <#command:find_package> command as required for curl to be considered found:

```
find_package(CURL [COMPONENTS <protocols>... <features>...])
```

Or to check for them optionally, allowing conditional handling in the code:

```
find_package(CURL [OPTIONAL_COMPONENTS <protocols>... <features>...])
```

Refer to the curl documentation for more information on supported protocols and features. Component names are case-sensitive and follow the upstream curl naming conventions.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

CURL::libcurl

Added in version 3.12.

Target encapsulating the curl usage requirements, available if curl is found.

### Result Variables
This module defines the following variables:

CURL_FOUND

Boolean indicating whether (the requested version of) curl and all required components were found.

CURL_VERSION

Added in version 4.0.

The version of curl found. This supersedes CURL_VERSION_STRING.

CURL_<component>_FOUND

Added in version 3.14.

Boolean indicating whether the specified component (curl protocol or feature) was found.

CURL_INCLUDE_DIRS

Include directories containing the curl/curl.h and other headers needed to use curl. Note:

When curl is found via config mode, this variable is available only with curl version 8.9 or newer.

CURL_LIBRARIES

List of libraries needed to link against to use curl. Note:

When curl is found via module mode, this is a list of library file paths. In config mode, this variable is available only with curl version 8.9 or newer and contains a list of imported targets.

### Hints
This module accepts the following variables:

CURL_NO_CURL_CMAKE

Added in version 3.17.

Set this variable to TRUE to disable searching for curl via config mode.

CURL_USE_STATIC_LIBS

Added in version 3.28.

Set this variable to TRUE to use static libraries. This is meaningful only when curl is not found via config mode.

### Deprecated Variables
The following variables are provided for backward compatibility:

CURL_VERSION_STRING

Deprecated since version 4.0: Superseded by CURL_VERSION.

The version of curl found.

### Examples
Finding the curl library and specifying the required minimum version:

```
find_package(CURL 7.61.0)
```

Finding the curl library and linking it to a project target:

```
find_package(CURL)
target_link_libraries(project_target PRIVATE CURL::libcurl)
```

Using components to check if the found curl supports specific protocols or features:

```
find_package(CURL OPTIONAL_COMPONENTS HTTPS SSL)
if(CURL_HTTPS_FOUND)

  # curl supports the HTTPS protocol
endif()
if(CURL_SSL_FOUND)

  # curl has SSL feature enabled
endif()
```

### FindCurses
Finds the curses or ncurses library:

```
find_package(Curses [...])
```

Curses is a terminal control library for Unix-like systems, used to build text user interface (TUI) applications. Originally developed in 1978, it has since evolved into multiple implementations, most notably ncurses (new curses), BSD curses, and PDCurses (a public domain curses library for non-Unix platforms).

### Result Variables
This module defines the following variables:

Curses_FOUND

Added in version 3.3.

Boolean indicating whether Curses was found.

CURSES_INCLUDE_DIRS

Added in version 3.1.

The include directories needed to use Curses.

CURSES_LIBRARIES

The libraries needed to use Curses.

CURSES_CFLAGS

Added in version 3.16.

Compiler flags which ought be given to C/C++ compilers when using Curses.

CURSES_HAVE_CURSES_H

Boolean indicating whether curses.h is available.

CURSES_HAVE_NCURSES_H

Boolean indicating whether ncurses.h is available.

CURSES_HAVE_NCURSES_NCURSES_H

Boolean indicating whether ncurses/ncurses.h is available.

CURSES_HAVE_NCURSES_CURSES_H

Boolean indicating whether ncurses/curses.h is available.

### Hints
This module accepts the following variables:

CURSES_NEED_NCURSES

Set this variable to TRUE before calling find_package(Curses) if the ncurses implementation functionality is specifically required.

CURSES_NEED_WIDE

Added in version 3.10.

Set this variable to TRUE before calling find_package(Curses) if Unicode (wide character) support is required.

### Deprecated Variables
The following variables are provided for backward compatibility:

CURSES_FOUND

Deprecated since version 4.2: Use Curses_FOUND, which has the same value.

Boolean indicating whether Curses was found.

CURSES_INCLUDE_DIR

Deprecated since version 3.1: Use the CURSES_INCLUDE_DIRS variable instead.

Path to a Curses include directory.

CURSES_LIBRARY

Deprecated since version 2.4: Use the CURSES_LIBRARIES variable instead.

Path to Curses library.

### Examples
Finding Curses and creating an imported interface target for linking it to a project target:

```
find_package(Curses)
if(Curses_FOUND AND NOT TARGET Curses::Curses)

  add_library(Curses::Curses INTERFACE IMPORTED)

  set_target_properties(

    Curses::Curses

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${CURSES_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${CURSES_INCLUDE_DIRS}"

  )
endif()
add_executable(app app.c)
target_link_libraries(app PRIVATE Curses::Curses)
```

When ncurses is specifically required:

```
set(CURSES_NEED_NCURSES TRUE)
find_package(Curses)
```

### FindCVS
Finds the Concurrent Versions System (CVS):

```
find_package(CVS [...])
```

### Result Variables
This module defines the following variables:

CVS_FOUND

Boolean indicating whether the cvs command-line client was found.

### Cache Variables
The following cache variables may also be set:

CVS_EXECUTABLE

Path to cvs command-line client.

### Examples
Finding CVS and executing it in a process:

```
find_package(CVS)
if(CVS_FOUND)

  execute_process(COMMAND ${CVS_EXECUTABLE} --help)
endif()
```

### FindCxxTest
Finds CxxTest <https://github.com/CxxTest/cxxtest>, a C++ unit testing framework suite, and provides a helper command to create test runners and integrate them with CTest:

```
find_package(CxxTest [...])
```

### Result Variables
This module defines the following variables:

CxxTest_FOUND

Added in version 4.2.

Boolean indicating whether the CxxTest framework was found.

CXXTEST_INCLUDE_DIRS

Include directories containing headers needed to use CxxTest.

CXXTEST_TESTGEN_EXECUTABLE

The path to the found CxxTest test generator script (Perl- or Python-based), selected based on the found interpreter or user-specified preference.

CXXTEST_TESTGEN_INTERPRETER

The path to the found Perl or Python interpreter used to run the test generator script, if needed (e.g., on platforms where script shebang lines are not supported).

### Cache Variables
The following cache variables may also be set:

CXXTEST_PYTHON_TESTGEN_EXECUTABLE

The path to the Python-based CxxTest test generator script.

CXXTEST_PERL_TESTGEN_EXECUTABLE

The path to the Perl-based CxxTest test generator script. Note:

Perl-based test generator script has been removed in CxxTest version 4.0 in favor of Python-based script.

### Hints
This module accepts the following variables before calling find_package(CxxTest):

CXXTEST_TESTGEN_ARGS

This variable can be set to specify a semicolon-separated list of command-line options to pass to the CxxTest code generator. If not set, the default value is --error-printer.

### Commands
This module provides the following command if CxxTest is found:

cxxtest_add_test

Creates a CxxTest runner and adds it to the CTest testing suite:

```
cxxtest_add_test(<test-name> <gen-source-file> <input-files-to-testgen>...)
```

Parameters:

<test-name>

The name of the test executable target to be created and registered as a test in the CTest suite.

<gen-source-file>

The name of the source file to be generated by the CxxTest code generator. This must be a relative path. It is interpreted relative to the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>).

<input-files-to-testgen>...

A list of header files containing test suite classes derived from the C++ class CxxTest::TestSuite, to be included in the test runner. These must be given as absolute paths.

### Deprecated Variables
The following variables are provided for backward compatibility:

CXXTEST_FOUND

Deprecated since version 4.2: Use CxxTest_FOUND, which has the same value.

Boolean indicating whether the CxxTest framework was found.

CXXTEST_USE_PYTHON

Deprecated since version 2.8.3: In earlier versions of CMake, this hint variable was used to force the use of the Python-based test generator instead of the Perl one, regardless of which scripting language was installed. It is now only considered when both Perl and Python interpreters are found.

A boolean hint variable that, when set to true, prefers the Python code generator over the Perl one if both interpreters are found. This variable is only relevant when using CxxTest version 3.

### Examples
The following example demonstrates how CxxTest can be used in CMake with this module. If CxxTest is found:

- Additional interface imported target <#imported-targets> is created manually in the project to encapsulate the CxxTest usage requirements and link it to specified tests. Such target is useful, for example, when dealing with multiple tests.

- Test generator is invoked to create foo_test.cc in the current binary directory from the input header foo_test.h located in the current source directory.

- An executable named unit_test_foo is built and registered as a test in CTest.

CMakeLists.txt

```
find_package(CxxTest)
# Create interface imported target:
if(CxxTest_FOUND AND NOT TARGET CxxTest::CxxTest)

  add_library(CxxTest::CxxTest INTERFACE IMPORTED)

  set_target_properties(

    CxxTest::CxxTest

    PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${CXXTEST_INCLUDE_DIRS}"

  )
endif()
# Add test:
if(CxxTest_FOUND)

  enable_testing()

  cxxtest_add_test(

    unit_test_foo

    foo_test.cc

    ${CMAKE_CURRENT_SOURCE_DIR}/foo_test.h

  )

  target_link_libraries(

    unit_test_foo

    PRIVATE

      CxxTest::CxxTest

      # Link any project targets as needed, if test depends on them:

      foo

  )
endif()
```

foo_test.h

```
#include <cxxtest/TestSuite.h>
class MyTestSuite : public CxxTest::TestSuite
{
public:

  void testAddition(void)

  {

    TS_ASSERT(1 + 1 > 1);

    TS_ASSERT_EQUALS(1 + 1, 2);

  }
};
```

### FindCygwin
Finds Cygwin, a POSIX-compatible environment that runs natively on Microsoft Windows:

```
find_package(Cygwin [...])
```

Note:

This module is primarily intended for use in other Find Modules <#find-modules> to help locate programs when using the find_*() commands, such as find_program() <#command:find_program>. In most cases, direct use of those commands is sufficient. Use this module only if a specific program is known to be installed via Cygwin and is usable from Windows.

### Result Variables
This module defines the following variables:

Cygwin_FOUND

Added in version 4.2.

Boolean indicating whether Cygwin was found.

CYGWIN_INSTALL_PATH

The path to the Cygwin root installation directory.

### Examples
Finding the Cygwin installation and using its path in a custom find module:

FindFoo.cmake

```
find_package(Cygwin)
find_program(Foo_EXECUTABLE NAMES foo PATHS ${CYGWIN_INSTALL_PATH}/bin)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Foo REQUIRED_VARS Foo_EXECUTABLE)
```

### See Also
•

The FindMsys <#module:FindMsys> module to find MSYS path in a similar way.

### FindDCMTK
Finds the DICOM ToolKit (DCMTK) libraries and applications:

```
find_package(DCMTK [...])
```

DCMTK is a set of libraries and applications implementing large parts of the DICOM Standard (Digital Imaging and Communications in Medicine).

Added in version 3.5: This module is now able to find a version of DCMTK that does or does not export a DCMTKConfig.cmake file.

DCMTK since its version 3.6.1_20140617 <https://git.dcmtk.org/?p=dcmtk.git;a=commit;h=662ae187c493c6b9a73dd5e3875372cebd0c11fe> supports and installs package configuration file <#config-file-packages> (DCMTKConfig.cmake) for use with the find_package() <#command:find_package> command in config mode.

This module now applies a two-step process:

- Step 1: Attempts to find DCMTK version providing a DCMTKConfig.cmake file and, if found, returns the results without further action.

- Step 2: If step 1 failed, this module falls back to module mode (it searches standard locations) and sets the DCMTK_* result variables.

Until all clients update to the more recent DCMTK, build systems will need to support different versions of DCMTK.

On any given system, the following combinations of DCMTK versions could be considered for the DCMTK installed on the system (for example, via a system package manager), or locally (for example, a custom installation, or through the FetchContent <#module:FetchContent> module):

Case

System DCMTK

Local DCMTK

Supported?

A

N/A

[ ] DCMTKConfig

YES

B

N/A

[X] DCMTKConfig

YES

C

[ ] DCMTKConfig

N/A

YES

D

[X] DCMTKConfig

N/A

YES

E

[ ] DCMTKConfig

[ ] DCMTKConfig

YES (*)

F

[X] DCMTKConfig

[ ] DCMTKConfig

NO

G

[ ] DCMTKConfig

[X] DCMTKConfig

YES

H

[X] DCMTKConfig

[X] DCMTKConfig

YES

Legend:

(*)

See the Troubleshooting section.

N/A

DCMTK is not available.

[ ] DCMTKConfig

DCMTK does NOT export a DCMTKConfig.cmake file.

[X] DCMTKConfig

DCMTK exports a DCMTKConfig.cmake file.

### Result Variables
This module defines the following variables:

DCMTK_FOUND

Boolean indicating whether DCMTK was found.

DCMTK_INCLUDE_DIRS

Include directories containing headers needed to use DCMTK.

DCMTK_LIBRARIES

Libraries needed to link against to use DCMTK.

### Hints
This module accepts the following variables:

DCMTK_DIR

(optional) Source directory for DCMTK.

### Troubleshooting
What to do if project finds a different version of DCMTK?

Remove DCMTK entry from the CMake cache per find_package() <#command:find_package> documentation, and re-run configuration. To find DCMTK on custom location use variables such as CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH>, or DCMTK_DIR.

### Example: Finding DCMTK
Finding DCMTK with this module:

```
find_package(DCMTK)
```

### Example: Finding DCMTK Without This Module
To explicitly use the DCMTKConfig.cmake package configuration file (recommended when possible) and find DCMTK in config mode without using this module, the NO_MODULE option can be given to find_package() <#command:find_package>:

```
find_package(DCMTK NO_MODULE)
```

### Example: Creating Imported Target
In the following example, DCMTK is searched with this module and an imported target <#imported-targets> is conditionally created to provide DCMTK usage requirements which can be easily linked to project targets. For example, if DCMTK is found in config mode, the DCMTK::DCMTK imported target will be available through the found config files instead:

```
find_package(DCMTK)
# Upstream DCMTKConfig.cmake already provides DCMTK::DCMTK imported target
if(DCMTK_FOUND AND NOT TARGET DCMTK::DCMTK)

  add_library(DCMTK::DCMTK INTERFACE IMPORTED)

  set_target_properties(

    DCMTK:DCMTK

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${DCMTK_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${DCMTK_INCLUDE_DIRS}"

  )
endif()
target_link_libraries(example PRIVATE DCMTK::DCMTK)
```

### FindDevIL
Finds the Developer's Image Library, DevIL <https://openil.sourceforge.net/>:

```
find_package(DevIL [<version>] [...])
```

Added in version 4.2: Support for the <version> argument in the find_package() <#command:find_package> call. Version can be also specified as a range.

The DevIL package internally consists of the following libraries, all distributed as part of the same release:

- The core Image Library (IL) This library is always required when working with DevIL, as it provides the main image loading and manipulation functionality.

- The Image Library Utilities (ILU) This library depends on IL and provides image filters and effects. It is only required if the application uses this extended functionality.

- The Image Library Utility Toolkit (ILUT) This library depends on both IL and ILU, and additionally provides an interface to OpenGL. It is only needed if the application uses DevIL together with OpenGL.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

DevIL::IL

Added in version 3.21.

Target encapsulating the core Image Library (IL) usage requirements, available if the DevIL package is found.

DevIL::ILU

Added in version 3.21.

Target encapsulating the Image Library Utilities (ILU) usage requirements, available if the DevIL package is found. This target also links to DevIL::IL for convenience, as ILU depends on the core IL library.

DevIL::ILUT

Added in version 3.21.

Target encapsulating the Image Library Utility Toolkit (ILUT) usage requirements, available if the DevIL package and its ILUT library are found. This target also links to DevIL::ILU, and transitively to DevIL::IL, since ILUT depends on both.

### Result Variables
This module defines the following variables:

DevIL_FOUND

Added in version 3.8.

Boolean indicating whether the (requested version of) DevIL package was found, including the IL and ILU libraries.

DevIL_VERSION

Added in version 4.2.

The version of the DevIL found.

DevIL_ILUT_FOUND

Added in version 3.21.

Boolean indicating whether the ILUT library was found. On most systems, ILUT is found when both IL and ILU are available.

### Cache Variables
The following cache variables may also be set:

IL_INCLUDE_DIR

The directory containing the il.h, ilu.h and ilut.h header files.

IL_LIBRARIES

The full path to the core Image Library (IL).

ILU_LIBRARIES

The full path to the ILU library.

ILUT_LIBRARIES

The full path to the ILUT library.

### Examples
Finding the DevIL package and linking against the core Image Library (IL):

```
find_package(DevIL)
target_link_libraries(app PRIVATE DevIL::IL)
```

Linking against the Image Library Utilities (ILU):

```
find_package(DevIL)
target_link_libraries(app PRIVATE DevIL::ILU)
```

Linking against the Image Library Utility Toolkit (ILUT):

```
find_package(DevIL)
target_link_libraries(app PRIVATE DevIL::ILUT)
```

### FindDoxygen
Finds Doxygen <https://www.doxygen.nl>, a source code documentation generator, along with some optional supporting tools, and provides a command for integrating Doxygen-based documentation into CMake projects:

```
find_package(Doxygen [<version>] [COMPONENTS <components>...] [...])
```

### Components
Additional Doxygen supporting tools, can be specified as components with the find_package() <#command:find_package> command:

```
find_package(Doxygen [COMPONENTS <components>...])
```

Supported components include:

doxygen

Added in version 3.9.

Finds the doxygen executable. This component is always automatically implied, even if not requested.

dot

Added in version 3.9.

Finds the Graphviz <https://graphviz.org> dot utility, used for rendering graphs and diagrams as part of the documentation.

mscgen

Added in version 3.9.

Finds the Message Chart Generator <https://www.mcternan.me.uk/mscgen/> utility used by Doxygen's \msc and \mscfile commands.

dia

Added in version 3.9.

Finds the Dia <https://wiki.gnome.org/Apps/Dia> diagram editor used by Doxygen's \diafile command.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>, each of which is defined if the corresponding component was requested and its associated executable was found:

Doxygen::doxygen

Added in version 3.9.

Imported executable target encapsulating the doxygen executable usage requirements, available if Doxygen is found.

Doxygen::dot

Added in version 3.9.

Imported executable target encapsulating the dot executable usage requirements, available if the above dot component is found.

Doxygen::mscgen

Added in version 3.9.

Imported executable target encapsulating the mscgen executable usage requirements, available if the above mscgen component is found.

Doxygen::dia

Added in version 3.9.

Imported executable target encapsulating the dia executable usage requirements, available if the above dia component is found.

These targets can be used in commands such as add_custom_command() <#command:add_custom_command> and are preferred over the older, now-deprecated variables like DOXYGEN_EXECUTABLE.

### Result Variables
This module defines the following variables:

Doxygen_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) doxygen executable and all requested required components were found.

Doxygen_VERSION

Added in version 4.2.

The version of Doxygen found (as reported by doxygen --version).

### Commands
This module provides the following command:

doxygen_add_docs

Added in version 3.9.

Adds a custom target for generating documentation with Doxygen during the build phase:

```
doxygen_add_docs(

  <target-name>

  [<files-or-dirs>...]

  [ALL]

  [USE_STAMP_FILE]

  [WORKING_DIRECTORY <dir>]

  [COMMENT <comment>]

  [CONFIG_FILE <file>]
)
```

By default, this convenience command also generates a configuration file named Doxyfile.<target-name> in the current binary directory at CMake configuration phase. It provides sensible defaults, so most projects only need to specify input files or directories. Additional behavior and configuration can be customized using variables described in the following sections.

The arguments are:

<target-name>

The name of the target to be created for generating documentation with Doxygen.

<files-or-dirs>...

One or more paths (files or directories) that serve as input sources for documentation. These are passed to the INPUT Doxygen configuration tag in the generated Doxyfile.<target-name>. Files listed here are also added as SOURCES argument of the underlying add_custom_target() <#command:add_custom_target> command so they appear in IDE project's source list.

When using the USE_STAMP_FILE option, only files (not directories, symlinks, or wildcards) are allowed, and each must exist when this command is called.

ALL

Added in version 3.12.

Adds the created documentation target to the default build target so that it runs automatically as part of the build phase.

USE_STAMP_FILE

Added in version 3.16.

Enables use of a stamp file to avoid regenerating documentation unless source files have changed.

Stamp file named <target-name>.stamp is created in the current binary directory by an underlying custom command.

With this option present, all entries in <files-or-dirs> must be existing files (i.e. no directories, symlinks or wildcards) when this command is called. An error is raised if any listed path is invalid.

Without this option, CMake will re-run Doxygen every time the <target-name> target is built, regardless of whether any input source file listed in <files-or-dirs> has changed.

WORKING_DIRECTORY <dir>

By default, the Doxygen working directory is the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>). This aligns with using relative input paths. Use this option, to change and override the directory where Doxygen is being run. The absolute path <dir> will then be used as the base point for relative paths.

Note also that Doxygen's default behavior is to strip the working directory from relative paths in the generated documentation. See the STRIP_FROM_PATH config tag in the Doxygen manual <https://www.doxygen.nl/manual/config.html> for more details.

COMMENT <comment>

If provided, the <comment> string will be passed as the COMMENT argument to the underlying add_custom_target() <#command:add_custom_target> command used to create the custom target internally. This appears in the build system output, when the target is built.

CONFIG_FILE <file>

Added in version 3.27.

If specified, the given file provided with full-path will be used as Doxygen configuration file instead of the default Doxyfile.<target-name>.

Variables for customizing Doxygen configuration

The doxygen_add_docs() command generates a Doxygen configuration file containing configuration tags. For example:

Doxygen.<target-name>

```
DOXYFILE_ENCODING      = UTF-8
PROJECT_NAME           = DoxygenExample
PROJECT_NUMBER         = 1.2.3
PROJECT_BRIEF          = "Example project using Doxygen"
PROJECT_LOGO           =
OUTPUT_DIRECTORY       = /home/user/doxygen-example/build
GENERATE_HTML          = YES
GENERATE_MAN           = NO
# ...
```

In CMake, these tags can be modified by setting input variables in form of DOXYGEN_<tag>, where <tag> is one of the configuration tags listed in the Doxygen manual <https://www.doxygen.nl/manual/config.html>.

For example, to modify the GENERATE_HTML and GENERATE_MAN configuration tags, the following variables can be set before calling doxygen_add_docs():

CMakeLists.txt

```
find_package(Doxygen)
if(Doxygen_FOUND)

  set(DOXYGEN_GENERATE_HTML NO)

  set(DOXYGEN_GENERATE_MAN YES)

  doxygen_add_docs(project_docs ${PROJECT_SOURCE_DIR})
endif()
```

Default configuration

By default, doxygen_add_docs() overrides several of Doxygen's settings to better suit typical CMake projects. Each of the following variables is explicitly set unless already defined prior to calling doxygen_add_docs(), with a few exceptions noted below:

DOXYGEN_HAVE_DOT

Set to YES if the dot component was requested and found, NO otherwise. Any existing value of DOXYGEN_HAVE_DOT is ignored.

DOXYGEN_DOT_MULTI_TARGETS

Set to YES by this module (note that this requires a dot version newer than 1.8.10). This option is only meaningful if DOXYGEN_HAVE_DOT is also set to YES.

DOXYGEN_GENERATE_LATEX

Set to NO by this module.

DOXYGEN_WARN_FORMAT

For Visual Studio based generators, this is set to the form recognized by the Visual Studio IDE: $file($line) : $text. For all other generators, Doxygen's default value is not overridden.

DOXYGEN_PROJECT_NAME

Populated with the name of the current project (i.e. PROJECT_NAME <#variable:PROJECT_NAME>).

DOXYGEN_PROJECT_NUMBER

Populated with the version of the current project (i.e. PROJECT_VERSION <#variable:PROJECT_VERSION>).

DOXYGEN_PROJECT_BRIEF

Populated with the description of the current project (i.e. PROJECT_DESCRIPTION <#variable:PROJECT_DESCRIPTION>).

DOXYGEN_INPUT

This variable is automatically populated with the list of files and directories passed to doxygen_add_docs(). For consistent behavior with other built-in commands like add_executable() <#command:add_executable>, add_library() <#command:add_library>, and add_custom_target() <#command:add_custom_target>, projects should not set this variable manually. If a variable named DOXYGEN_INPUT is set by the project, it will be ignored and a warning will be issued.

DOXYGEN_RECURSIVE

Set to YES by this module.

DOXYGEN_EXCLUDE_PATTERNS

If the <files-or-dirs> argument of doxygen_add_docs() contains directories, this variable will specify patterns used to exclude files from them. The following patterns are added by default to ensure CMake-specific files and directories are not included in the input. If the project sets this variable, those contents are merged with these additional patterns rather than replacing them:

```
*/.git/*
*/.svn/*
*/.hg/*
*/CMakeFiles/*
*/_CPack_Packages/*
DartConfiguration.tcl
CMakeLists.txt
CMakeCache.txt
```

DOXYGEN_OUTPUT_DIRECTORY

Set to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> by this module. If the project provides its own value for this and it is a relative path, it will be interpreted relative to the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>). This is necessary because Doxygen will normally be run from a directory within the source tree so that relative source paths work as expected. If this directory does not exist, it will be recursively created prior to executing Doxygen.

Lists

A number of Doxygen config tags accept lists of values, and Doxygen requires them to be separated by whitespace, while in CMake a list is a string with items separated by semicolons <#cmake-language-lists>.

The doxygen_add_docs() specifically checks for the following Doxygen config tags and converts their associated CMake DOXYGEN_<tag> variable values into the Doxygen-formatted lists if set:

- ABBREVIATE_BRIEF

- ALIASES

- CITE_BIB_FILES

- DIAFILE_DIRS

- DOTFILE_DIRS

- DOT_FONTPATH

- ENABLED_SECTIONS

- EXAMPLE_PATH

- EXAMPLE_PATTERNS

- EXCLUDE

- EXCLUDE_PATTERNS

- EXCLUDE_SYMBOLS

- EXPAND_AS_DEFINED

- EXTENSION_MAPPING

- EXTRA_PACKAGES

- EXTRA_SEARCH_MAPPINGS

- FILE_PATTERNS

- FILTER_PATTERNS

- FILTER_SOURCE_PATTERNS

- HTML_EXTRA_FILES

- HTML_EXTRA_STYLESHEET

- IGNORE_PREFIX

- IMAGE_PATH

- INCLUDE_FILE_PATTERNS

- INCLUDE_PATH

- INPUT

- LATEX_EXTRA_FILES

- LATEX_EXTRA_STYLESHEET

- MATHJAX_EXTENSIONS

- MSCFILE_DIRS

- PLANTUML_INCLUDE_PATH

- PREDEFINED

- QHP_CUST_FILTER_ATTRS

- QHP_SECT_FILTER_ATTRS

- STRIP_FROM_INC_PATH

- STRIP_FROM_PATH

- TAGFILES

- TCL_SUBST

For example, to customize the Doxygen file patterns, a usual semicolon-separated list <#cmake-language-lists> can be set in CMake:

CMakeLists.txt

```
find_package(Doxygen)
if(Doxygen_FOUND)

  set(DOXYGEN_FILE_PATTERNS *.c *.cxx *.h *.hxx)

  doxygen_add_docs(example_docs ${CMAKE_CURRENT_SOURCE_DIR} ALL)
endif()
```

Which will produce a Doxygen list of patterns separated by spaces in the generated configuration file:

Doxyfile.<target-name>

```
# ...
FILE_PATTERNS          = *.c *.cxx *.h *.hxx
```

Automatic quoting

If a Doxygen single-value tag contains spaces, their values must be surrounded by double quotes ("..."). doxygen_add_docs() automatically quotes values of the following Doxygen tags when generating the Doxyfile, if they contain at least one space:

- CHM_FILE

- DIA_PATH

- DOCBOOK_OUTPUT

- DOCSET_FEEDNAME

- DOCSET_PUBLISHER_NAME

- DOT_FONTNAME

- DOT_PATH

- EXTERNAL_SEARCH_ID

- FILE_VERSION_FILTER

- GENERATE_TAGFILE

- HHC_LOCATION

- HTML_FOOTER

- HTML_HEADER

- HTML_OUTPUT

- HTML_STYLESHEET

- INPUT_FILTER

- LATEX_FOOTER

- LATEX_HEADER

- LATEX_OUTPUT

- LAYOUT_FILE

- MAN_OUTPUT

- MAN_SUBDIR

- MATHJAX_CODEFILE

- MSCGEN_PATH

- OUTPUT_DIRECTORY

- PERL_PATH

- PLANTUML_JAR_PATH

- PROJECT_BRIEF

- PROJECT_LOGO

- PROJECT_NAME

- QCH_FILE

- QHG_LOCATION

- QHP_CUST_FILTER_NAME

- QHP_VIRTUAL_FOLDER

- RTF_EXTENSIONS_FILE

- RTF_OUTPUT

- RTF_STYLESHEET_FILE

- SEARCHDATA_FILE

- USE_MDFILE_AS_MAINPAGE

- WARN_FORMAT

- WARN_LOGFILE

- XML_OUTPUT

DOXYGEN_VERBATIM_VARS

Added in version 3.11.

A CMake input variable used by doxygen_add_docs() to specify a list of Doxygen input variables (including their leading DOXYGEN_ prefix) whose values should be passed to the generated Doxyfile configuration without automatic quoting.

When using this variable, the project is then responsible for ensuring that those variables' values make sense when placed directly in the generated Doxyfile configuration. For list variables, items are still separated by spaces in the output, but no quoting is applied to the individual items.

For certain Doxygen tags, such as ALIASES, automatic quoting done by doxygen_add_docs() may interfere with correct syntax (e.g., embedded quotes).

For example, the following will quote DOXYGEN_PROJECT_BRIEF, but skip each item in the DOXYGEN_ALIASES list (bracket syntax <#bracket-argument> is used to make working with embedded quotes easier):

CMakeLists.txt

```
find_package(Doxygen)
if(Doxygen_FOUND)

  set(DOXYGEN_PROJECT_BRIEF "String with spaces")

  set(

    DOXYGEN_ALIASES

    [[somealias="@some_command param"]]

    "anotherAlias=@foobar"

  )

  set(DOXYGEN_VERBATIM_VARS DOXYGEN_ALIASES)

  add_doxygen_docs(project_docs ${PROJECT_SOURCE_DIR})
endif()
```

The resultant Doxyfile configuration will contain the following lines:

Doxyfile.project_docs

```
PROJECT_BRIEF = "String with spaces"
ALIASES       = somealias="@some_command param" anotherAlias=@foobar
```

### Deprecated Variables
For compatibility with previous versions of CMake, the following variables are also defined but they are deprecated and should no longer be used:

DOXYGEN_FOUND

Deprecated since version 4.2: Use Doxygen_FOUND.

Boolean indicating whether the (requested version of) doxygen executable and all requested required components were found. It has a boolean value of YES or NO.

DOXYGEN_EXECUTABLE

Deprecated since version 3.9: Use Doxygen::doxygen imported target instead of referring to the doxygen executable directly.

Cache variable containing the path to the doxygen command.

DOXYGEN_DOT_FOUND

Deprecated since version 3.9: Use Doxygen_dot_FOUND.

Boolean result variable indicating whether dot executable was found.

DOXYGEN_DOT_EXECUTABLE

Deprecated since version 3.9: Use Doxygen::dot imported target instead of referring to the dot executable directly.

Cache variable containing the path to the dot command-line executable.

DOXYGEN_DOT_PATH

Deprecated since version 3.9.

Result variable containing the path to the directory where the dot executable is located as reported in DOXYGEN_DOT_EXECUTABLE. The path may have forward slashes even on Windows and is not suitable for direct substitution into a Doxyfile.in template. If this value is needed, get the IMPORTED_LOCATION <#prop_tgt:IMPORTED_LOCATION> property of the Doxygen::dot target and use get_filename_component() <#command:get_filename_component> to extract the directory part of that path. Consider also using file(TO_NATIVE_PATH) <#to-native-path> to prepare the path for a Doxygen configuration file.

DOXYGEN_SKIP_DOT

Deprecated since version 3.9.

This hint variable has no effect when specifying components in find_package(Doxygen COMPONENTS ...). In backward-compatibility mode (i.e. without specifying components) it prevents this find module from searching for Graphviz's dot utility.

DOXYGEN_VERSION

Deprecated since version 4.2: Superseded by the Doxygen_VERSION.

The version of Doxygen found.

### Examples: Finding Doxygen
Finding Doxygen:

```
find_package(Doxygen)
```

Or, finding Doxygen and specifying a minimum required version:

```
find_package(Doxygen 1.9)
```

Or, finding Doxygen and making it required (if not found, processing stops with an error message):

```
find_package(Doxygen REQUIRED)
```

Or, finding Doxygen as required and specifying dot tool as required component and mscgen and dia tools as optional components:

```
find_package(Doxygen REQUIRED COMPONENTS dot OPTIONAL_COMPONENTS mscgen dia)
```

### Example: Using Doxygen in CMake
The following example demonstrates how to find Doxygen and create documentation from source files at build phase. Once project is built, generated documentation files will be located in the html directory inside the project binary directory:

CMakeLists.txt

```
cmake_minimum_required(VERSION 3.24)
project(

  DoxygenExample

  DESCRIPTION "Example project using Doxygen"

  VERSION 1.2.3
)
add_executable(example example.c)
find_package(Doxygen)
if(Doxygen_FOUND)

  doxygen_add_docs(project_docs example.c ALL USE_STAMP_FILE)
endif()
```

example.c

```
/**

 * @file example.c

 * @brief A simple example to demonstrate Doxygen.

 */
#include <stdio.h>
/**

 * @brief Calculates the sum of two integers.

 *

 * @param a First integer.

 * @param b Second integer.

 * @return Sum of a and b.

 *

 * @par Example

 * @code

 * int result = sum(3, 4);

 * printf("%d\n", result); // Outputs: 7

 * @endcode

 */
int sum(int a, int b) { return a + b; }
/**

 * @brief Main function.

 *

 * @return 0 on success.

 */
int main(void)
{

  int result = sum(5, 7);

  printf("Result: %d\n", result);

  return 0;
}
```

### Example: Configuring Doxygen With Variables
In the following example, Doxygen configuration is customized using CMake variables. The configuration sets file patterns when using a directory as the source input (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>), enables a theme toggle for switching between light and dark modes, suppresses Doxygen's standard output during the build phase, specifies a Markdown file as the main page, and disables warnings about undocumented code:

```
find_package(Doxygen)
if(Doxygen_FOUND)

  set(DOXYGEN_FILE_PATTERNS *.c *.cxx *.md)

  set(DOXYGEN_HTML_COLORSTYLE "TOGGLE")

  set(DOXYGEN_QUIET YES)

  set(DOXYGEN_USE_MDFILE_AS_MAINPAGE "${CMAKE_CURRENT_SOURCE_DIR}/README.md")

  set(DOXYGEN_WARN_IF_UNDOCUMENTED NO)

  doxygen_add_docs(example_docs ${CMAKE_CURRENT_SOURCE_DIR} ALL)
endif()
```

### Example: Custom Configuration File
In the following example, a custom Doxyfile configuration file is created in the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>) prior to calling the doxygen_add_docs(). This allows project-specific configuration tags to be customized as needed:

CMakeLists.txt

```
find_package(Doxygen)
if(Doxygen_FOUND)

  configure_file(Doxyfile.in Doxyfile)

  doxygen_add_docs(

    example_docs

    foo.c bar.c

    ALL

    USE_STAMP_FILE

    COMMENT "Generating project documentation with custom Doxyfile"

    CONFIG_FILE ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile

  )
endif()
```

Doxyfile.in

```
PROJECT_NAME           = "Customized project name"
OUTPUT_DIRECTORY       = "@CMAKE_CURRENT_BINARY_DIR@"
# ...
```

### FindEnvModules
Added in version 3.15.

Finds an Environment Modules implementation and provides commands for use in CMake scripts:

```
find_package(EnvModules [...])
```

The Environment Modules system is a command-line tool that manages Unix-like shell environments by dynamically modifying environment variables. It is commonly used in High-Performance Computing (HPC) environments to support multiple software versions or configurations.

This module is compatible with the two most common implementations:

- Lua-based Lmod

- TCL-based Environment Modules

This module is primarily intended for setting up compiler and library environments within a CTest Script <#ctest-script> (ctest -S). It may also be used in a CMake Script <#script-processing-mode> (cmake -P).

Note:

The loaded environment will not persist beyond the end of the calling process. Do not use this module in CMake project code (such as CMakeLists.txt) to load compiler environments, as the environment changes will not be available during the build phase. In such a case, load the desired environment before invoking CMake or the generated build system.

### Result Variables
This module defines the following variables:

EnvModules_FOUND

Boolean indicating whether a compatible Environment Modules framework was found.

### Cache Variables
The following cache variables may also be set:

EnvModules_COMMAND

The path to a low level module command to use.

### Hints
This module accepts the following variables before calling the find_package(EnvModules):

ENV{MODULESHOME}

This environment variable is usually set by the Environment Modules implementation, and can be used as a hint to locate the module command to execute.

### Commands
This module provides the following commands for interacting with the Environment Modules system, if found:

env_module

Executes an arbitrary module command:

```
env_module(<command> <args>...)
env_module(

  COMMAND <command> <args>...

  [OUTPUT_VARIABLE <out-var>]

  [RESULT_VARIABLE <ret-var>]
)
```

The options are:

COMMAND <command> <args>...

The module sub-command and arguments to execute as if passed directly to the module command in the shell environment.

OUTPUT_VARIABLE <out-var>

Stores the standard output of the executed module command in the specified variable.

RESULT_VARIABLE <ret-var>

Stores the return code of the executed module command in the specified variable.

env_module_swap

Swaps one module for another:

```
env_module_swap(

  <out-mod>

  <in-mod>

  [OUTPUT_VARIABLE <out-var>]

  [RESULT_VARIABLE <ret-var>]
)
```

This is functionally equivalent to the module swap <out-mod> <in-mod> shell command.

The options are:

OUTPUT_VARIABLE <out-var>

Stores the standard output of the executed module command in the specified variable.

RESULT_VARIABLE <ret-var>

Stores the return code of the executed module command in the specified variable.

env_module_list

Retrieves the list of currently loaded modules:

```
env_module_list(<out-var>)
```

This is functionally equivalent to the module list shell command. The result is stored in <out-var> as a properly formatted CMake semicolon-separated list <#cmake-language-lists> variable.

env_module_avail

Retrieves the list of available modules:

```
env_module_avail([<mod-prefix>] <out-var>)
```

This is functionally equivalent to the module avail <mod-prefix> shell command. The result is stored in <out-var> as a properly formatted CMake semicolon-separated list <#cmake-language-lists> variable.

### Examples
In the following example, this module is used in a CTest script to configure the compiler and libraries for a Cray Programming Environment. After the Environment Modules system is found, the env_module() command is used to load the necessary compiler, MPI, and scientific libraries to set up the build environment. The CRAYPE_LINK_TYPE environment variable is set to dynamic to specify dynamic linking. This instructs the Cray Linux Environment compiler driver to link against dynamic libraries at runtime, rather than linking static libraries at compile time. As a result, the compiler produces dynamically linked executable files.

example-script.cmake

```
set(CTEST_BUILD_NAME "CrayLinux-CrayPE-Cray-dynamic")
set(CTEST_BUILD_CONFIGURATION Release)
set(CTEST_BUILD_FLAGS "-k -j8")
set(CTEST_CMAKE_GENERATOR "Unix Makefiles")
# ...
find_package(EnvModules REQUIRED)
# Clear all currently loaded Environment Modules to start with a clean state
env_module(purge)
# Load the base module-handling system to use other modules
env_module(load modules)
# Load Cray Programming Environment (Cray PE) support, which manages
# platform-specific optimizations and architecture selection
env_module(load craype)
# Load the Cray programming environment
env_module(load PrgEnv-cray)
# Load settings targeting the Intel Knights Landing (KNL) CPU architecture
env_module(load craype-knl)
# Load the Cray MPI (Message Passing Interface) library, needed for
# distributed computing
env_module(load cray-mpich)
# Load Cray's scientific library package, which includes optimized math
# libraries (like BLAS, LAPACK)
env_module(load cray-libsci)
set(ENV{CRAYPE_LINK_TYPE} dynamic)
# ...
```

### FindEXPAT
Finds the native Expat headers and library:

```
find_package(EXPAT [<version>] [...])
```

Expat is a stream-oriented XML parser library written in C.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

EXPAT::EXPAT

Added in version 3.10.

Target encapsulating the Expat library (expat) usage requirements. This target is available only if Expat is found.

### Result Variables
This module defines the following variables:

EXPAT_FOUND

Boolean indicating whether (the requested version of) Expat was found.

EXPAT_VERSION

Added in version 4.2.

The version of Expat found.

EXPAT_INCLUDE_DIRS

Include directories containing expat.h and related headers needed to use Expat.

EXPAT_LIBRARIES

Libraries needed to link against to use Expat.

### Hints
This module accepts the following variables:

EXPAT_USE_STATIC_LIBS

Added in version 3.28.

Set to TRUE to use static libraries.

Added in version 3.31: Implemented on non-Windows platforms.

### Deprecated Variables
The following variables are provided for backward compatibility:

EXPAT_VERSION_STRING

Deprecated since version 4.2: Superseded by the EXPAT_VERSION.

The version of Expat found.

### Examples
Finding Expat library and linking it to a project target:

```
find_package(EXPAT)
target_link_libraries(project_target PRIVATE EXPAT::EXPAT)
```

### FindFLEX
Finds the Fast Lexical Analyzer (Flex) command-line generator and its library, and provides CMake commands to create custom build rules for using Flex:

```
find_package(FLEX [<version>] [...])
```

Flex generates lexical analyzers, also known as scanners or lexers. It also includes a runtime library (fl) that supplies support functions for the generated scanners, such as input handling, buffer management, and error reporting.

### Result Variables
This module defines the following variables:

FLEX_FOUND

Boolean indicating whether (the requested version of) Flex was found.

FLEX_VERSION

The version of Flex found.

FLEX_INCLUDE_DIRS

The include directories containing headers for using Flex library.

FLEX_LIBRARIES

The libraries needed to link against to use Flex library.

### Cache Variables
The following cache variables may also be set:

FLEX_EXECUTABLE

The path to the flex executable.

### Commands
This module provides the following commands if flex is found:

### Generating Scanners
flex_target

Creates a custom build rule to generate a scanner file from a lex file using Flex:

```
flex_target(

  <name>

  <input-lex-file>

  <output-scanner-file>

  [DEFINES_FILE <header>]

  [OPTIONS <options>...]

  [COMPILE_FLAGS <string>] # Deprecated
)
```

Changed in version 3.17: When policy CMP0098 <#policy:CMP0098> is set to NEW, flex runs in the CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR> directory.

<name>

String used as an identifier for this command invocation.

<input-lex-file>

The path to an input Flex source file (.l). If given as a relative path, it will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

<output-scanner-file>

The path of the output file to be generated by Flex. If given as a relative path, it will be interpreted relative to the current Flex working directory.

DEFINES_FILE <header>

Added in version 3.5.

If Flex is configured to output a header file, this option may be used to specify its name. If given as a relative path, it will be interpreted relative to the current Flex working directory.

OPTIONS <options>...

Added in version 4.0.

A semicolon-separated list <#cmake-language-lists> of extra options added to the flex command line.

COMPILE_FLAGS <string>

Deprecated since version 4.0: Superseded by OPTIONS <options>....

A string of space-separated extra options added to the flex command line. A semicolon-separated list <#cmake-language-lists> will not work.

Command variables

This command also defines the following variables:

FLEX_<name>_DEFINED

Boolean indicating whether this command was successfully invoked.

FLEX_<name>_INPUT

The Flex source file, an alias for <input-lex-file>.

FLEX_<name>_OUTPUT_HEADER

Added in version 3.5.

The header file generated by flex, if any.

FLEX_<name>_OUTPUTS

A list of files generated by flex, including the output scanner file, and the header file.

FLEX_<name>_OPTIONS

Added in version 4.0.

A list of command-line options used for the flex command.

### Adding Dependency Between Scanner and Parser
add_flex_bison_dependency

Adds the required dependency between a scanner and a parser:

```
add_flex_bison_dependency(<flex-name> <bison-name>)
```

Flex scanners often rely on token definitions generated by Bison, meaning the code produced by Flex depends on the header file created by Bison.

This command adds the required dependency between a scanner and a parser where <flex-name> and <bison-name> are the first parameters of respectively flex_target(<name> ...) and bison_target(<name> ...) <#command:bison_target> commands.

### Examples: Finding Flex
Finding Flex:

```
find_package(FLEX)
```

Finding Flex and specifying its minimum required version:

```
find_package(FLEX 2.5.13)
```

Finding Flex and making it required (if Flex is not found, processing stops with an error message):

```
find_package(FLEX 2.5.13 REQUIRED)
```

### Example: Generating Scanner
Finding Flex and generating scanner source file in the current binary directory from the lex source file in the current source directory:

```
find_package(FLEX)
if(FLEX_FOUND)

  flex_target(MyScanner lexer.l lexer.cpp)
endif()
add_executable(foo foo.cc ${FLEX_MyScanner_OUTPUTS})
```

### Example: Command-line Options
Adding additional command-line options to the flex executable can be passed as a list. For example, adding the --warn option to report warnings, and the --noline (-L) to not generate #line directives.

```
find_package(FLEX)
if(FLEX_FOUND)

  flex_target(MyScanner lexer.l lexer.cpp OPTIONS --warn --noline)
endif()
```

Generator expressions <#manual:cmake-generator-expressions(7)> can be used in the OPTIONS <options>... argument. For example, to add the --debug (-d) option only for the Debug build type:

```
find_package(FLEX)
if(FLEX_FOUND)

  flex_target(MyScanner lexer.l lexer.cpp OPTIONS $<$<CONFIG:Debug>:--debug>)
endif()
```

### Example: Using Flex Library
Finding Flex and creating an interface imported target <#imported-targets> that encapsulates its library usage requirements for linking to a project target:

```
find_package(FLEX)
if(FLEX_FOUND AND NOT TARGET FLEX::fl)

  add_library(FLEX::fl INTERFACE IMPORTED)

  set_target_properties(

    FLEX::fl

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${FLEX_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${FLEX_LIBRARIES}"

  )
endif()
if(FLEX_FOUND)

  flex_target(MyScanner lexer.l lexer.cpp)
endif()
add_executable(Foo foo.cc ${FLEX_MyScanner_OUTPUTS})
target_link_libraries(Foo PRIVATE FLEX::fl)
```

### Example: Using Flex and Bison
The following example demonstrates, how to use Flex and Bison <#module:FindBISON> in CMake:

```
find_package(BISON)
find_package(FLEX)
if(BISON_FOUND AND FLEX_FOUND)

  bison_target(MyParser parser.y parser.cpp)

  flex_target(MyScanner lexer.l lexer.cpp)

  add_flex_bison_dependency(MyScanner MyParser)
endif()
add_executable(Foo foo.cc ${BISON_MyParser_OUTPUTS} ${FLEX_MyScanner_OUTPUTS})
# ...
```

### See Also
•

The FindBISON <#module:FindBISON> module to find Bison parser generator.

### FindFLTK
Finds the Fast Light Toolkit (FLTK), a cross-platform toolkit for GUI development:

```
find_package(FLTK [...])
```

FLTK uses CMake-based build system and provides a package configuration file for projects to find it. As of its 1.4.0 version it also provides Imported Targets <#imported-targets> that encapsulate usage requirements. For example, fltk::fltk, which can be linked to project targets where FLTK is needed. This module takes that into account and first attempts to find FLTK in config mode. If the configuration file is not available, it falls back to module mode and searches standard locations. See also to the official FLTK documentation for more information, how to use FLTK with CMake.

Added in version 3.11: Debug and release (optimized) library variants are found separately and use per-configuration <#build-configurations> variables.

### Result Variables
This module defines the following variables:

FLTK_FOUND

Boolean indicating whether FLTK was found.

FLTK_LIBRARIES

Libraries needed to link against to use FLTK.

FLTK_WRAP_UI

Boolean indicating whether the fluid executable is found. This variable is available only if FLTK is found in module mode and can be used, for example, to conditionally invoke the fltk_wrap_ui() <#command:fltk_wrap_ui> command if it is needed and available.

### Cache Variables
The following cache variables are also available to set or use:

FLTK_FLUID_EXECUTABLE

The path to the fluid binary tool.

FLTK_INCLUDE_DIR

The include directory containing header files needed to use FLTK.

FLTK_BASE_LIBRARY_RELEASE

Added in version 3.11.

The path to the release (optimized) FLTK base library.

FLTK_BASE_LIBRARY_DEBUG

Added in version 3.11.

The path to the debug FLTK base library.

FLTK_GL_LIBRARY_RELEASE

Added in version 3.11.

The path to the release (optimized) FLTK GL library.

FLTK_GL_LIBRARY_DEBUG

Added in version 3.11.

The path to the debug FLTK GL library.

FLTK_FORMS_LIBRARY_RELEASE

Added in version 3.11.

The path to the release (optimized) FLTK Forms library.

FLTK_FORMS_LIBRARY_DEBUG

Added in version 3.11.

The path to the debug FLTK Forms library.

FLTK_IMAGES_LIBRARY_RELEASE

Added in version 3.11.

The path to the release (optimized) FLTK Images protobuf library.

FLTK_IMAGES_LIBRARY_DEBUG

Added in version 3.11.

The path to the debug FLTK Images library.

### Input Variables
By default, this module searches for all FLTK libraries and its fluid executable. The following variables can be set before calling find_package(FLTK) to indicate which elements are optional for a successful configuration:

FLTK_SKIP_FLUID

Set to boolean true to mark the fluid executable as optional.

FLTK_SKIP_FORMS

Set to boolean true to mark the FLTK Forms library as optional; it will therefore not be included in the FLTK_LIBRARIES result variable.

FLTK_SKIP_IMAGES

Set to boolean true to mark the FLTK Image library as optional; it will therefore not be included in the FLTK_LIBRARIES result variable.

FLTK_SKIP_OPENGL

Set to boolean true to mark the FLTK OpenGL library as optional; it will therefore not be included in the FLTK_LIBRARIES result variable.

### Examples
Finding FLTK and conditionally creating a fltk::fltk imported interface target, if it is not provided by the upstream FLTK package. Imported target can then be linked to a project target:

```
find_package(FLTK)
if(FLTK_FOUND AND NOT TARGET fltk::fltk)

  add_library(fltk::fltk INTERFACE IMPORTED)

  set_target_properties(

    fltk::fltk

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${FLTK_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${FLTK_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE fltk::fltk)
```

### FindFLTK2
Note:

This module is specifically for FLTK version 2.x. The 2.0 series was originally a development branch intended as the next major version of FLTK. However, it never reached stable release status, and active development has shifted back to the FLTK 1.x branch. For finding FLTK, including stable and modern versions, use the FindFLTK <#module:FindFLTK> module instead.

Finds the Fast Light Toolkit (FLTK) version 2.x, a cross-platform toolkit for GUI development:

```
find_package(FLTK2 [...])
```

### Result Variables
This module defines the following variables:

FLTK2_FOUND

Boolean indicating whether FLTK 2.x was found.

FLTK2_LIBRARIES

Libraries needed to link against to use FLTK 2.x.

FLTK2_WRAP_UI

Boolean indicating whether the fluid2 executable is found. This variable can be used, for example, to conditionally invoke the fltk_wrap_ui() <#command:fltk_wrap_ui> command if it is needed and available.

### Cache Variables
The following cache variables may also be set:

FLTK2_FLUID_EXECUTABLE

The path to the fluid2 binary tool.

FLTK2_INCLUDE_DIR

The directory containing header files needed to use FLTK 2.x.

FLTK2_BASE_LIBRARY

The path to the FLTK 2.x library (fltk2).

FLTK2_GL_LIBRARY

The path to the FLTK 2.x OpenGL compatibility library (fltk2_gl).

FLTK2_IMAGES_LIBRARY

The path to the FLTK 2.x Images library (fltk2_images).

### Examples
Finding FLTK version 2:

```
find_package(FLTK2)
```

### See Also
•

The FindFLTK <#module:FindFLTK> module to find FLTK in a version-agnostic way.

### FindFontconfig
Added in version 3.14.

Finds Fontconfig, a library for font configuration and customization:

```
find_package(Fontconfig [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Fontconfig::Fontconfig

Target encapsulating the Fontconfig usage requirements, available if Fontconfig is found.

### Result Variables
This module defines the following variables:

Fontconfig_FOUND

Boolean indicating whether (the requested version of) Fontconfig was found.

Fontconfig_VERSION

The version of Fontconfig found.

Fontconfig_LIBRARIES

The libraries to link against to use Fontconfig.

Fontconfig_INCLUDE_DIRS

The include directories containing headers needed to use Fontconfig.

Fontconfig_COMPILE_OPTIONS

Compiler options needed to use Fontconfig. These should be passed to target_compile_options() <#command:target_compile_options> when not using the Fontconfig::Fontconfig imported target.

### Examples
Finding Fontconfig and linking it to a project target:

```
find_package(Fontconfig)
target_link_libraries(project_target PRIVATE Fontconfig::Fontconfig)
```

### FindFreetype
Finds the FreeType font renderer library:

```
find_package(Freetype [<version>] [...])
```

Added in version 3.7: Debug and Release (optimized) library variants are found separately.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Freetype::Freetype

Added in version 3.10.

Target encapsulating the Freetype library usage requirements, available if Freetype is found.

### Result Variables
This module defines the following variables:

Freetype_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Freetype was found.

Freetype_VERSION

Added in version 4.2.

The version of Freetype found.

FREETYPE_INCLUDE_DIRS

Include directories containing headers needed to use Freetype. This is the concatenation of FREETYPE_INCLUDE_DIR_ft2build and FREETYPE_INCLUDE_DIR_freetype2 variables.

FREETYPE_LIBRARIES

Libraries needed to link against for using Freetype.

Added in version 3.7: Debug and Release library variants are found separately.

### Cache Variables
The following cache variables may also be set:

FREETYPE_INCLUDE_DIR_ft2build

The directory containing the main Freetype API configuration header.

FREETYPE_INCLUDE_DIR_freetype2

The directory containing Freetype public headers.

### Hints
This module accepts the following variables:

FREETYPE_DIR

The user may set this environment variable to the root directory of a Freetype installation to find Freetype in non-standard locations.

### Deprecated Variables
The following variables are provided for backward compatibility:

FREETYPE_FOUND

Deprecated since version 4.2: Use Freetype_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Freetype was found.

FREETYPE_VERSION_STRING

Deprecated since version 4.2: Superseded by the Freetype_VERSION.

The version of Freetype found.

### Examples
Finding Freetype and linking it to a project target:

```
find_package(Freetype)
target_link_libraries(project_target PRIVATE Freetype::Freetype)
```

### FindGettext
Finds the GNU gettext tools and provides commands for producing multi-lingual messages:

```
find_package(Gettext [<version>] [...])
```

GNU gettext is a system for internationalization (i18n) and localization (l10n), consisting of command-line tools and a runtime library (libintl). This module finds the gettext tools (such as msgmerge and msgfmt), while the runtime library can be found using the separate FindIntl <#module:FindIntl> module, which abstracts libintl handling across various implementations.

Common file types used with gettext:

POT files

Portable Object Template (.pot) files used as the source template for translations.

PO files

Portable Object (.po) files containing human-readable translations.

MO files

Machine Object (.mo) files compiled from .po files for runtime use.

### Result Variables
This module defines the following variables:

Gettext_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) gettext was found.

Gettext_VERSION

Added in version 4.2.

The version of gettext found.

### Cache Variables
The following cache variables may also be set:

GETTEXT_MSGMERGE_EXECUTABLE

The full path to the msgmerge tool for merging message catalog and template.

GETTEXT_MSGFMT_EXECUTABLE

The full path to the msgfmt tool for compiling message catalog to a binary format.

### Commands
This module provides the following commands to work with gettext in CMake, if gettext is found:

gettext_process_po_files

Creates a build rule that processes one or more .po translation files into binary .mo files for a specified translatable language locale:

```
gettext_process_po_files(

  <language>

  [ALL]

  [INSTALL_DESTINATION <destdir>]

  PO_FILES <po-files>...
)
```

This command defines a custom target that compiles the given <po-files> into .mo files for the specified <language>. On first invocation, it also creates a global custom target named pofiles, to which all subsequent invocations contribute. This target can be used to build all translation files collectively or referenced in other CMake commands.

This command should be invoked separately for each language locale to generate the appropriate .mo files per locale.

The arguments are:

<language>

The target translatable language locale of the PO files. This string is typically formatted as a locale identifier (e.g., de_DE for German as used in Germany, or de_AT for German as used in Austria, etc.). The part before the underscore specifies the language, and the part after specifies the country or regional variant. In some cases, a shorter form using only the language code (e.g., de) may also be used.

ALL

This option adds the generated target to the default CMake build target so that translations are built by default.

INSTALL_DESTINATION <destdir>

Specifies the installation directory for the generated .mo files at the install phase. If specified, files are installed to: <destdir>/<language>/LC_MESSAGES/*.mo. If not specified, files are not installed.

PO_FILES <po-files>...

A list of one or more .po translation files to be compiled into .mo files at build phase for the specified <language>. Relative paths will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

gettext_process_pot_file

Creates a build rule that processes a gettext Portable Object Template (.pot) file and associated .po files into compiled gettext Machine Object (.mo) files:

```
gettext_process_pot_file(

  <pot-file>

  [ALL]

  [INSTALL_DESTINATION <destdir>]

  LANGUAGES <languages>...
)
```

This command defines a custom target named potfiles that compiles the given <pot-file> and language-specific .po files into binary .mo files for each specified language. The corresponding <language>.po files must exist in the current binary directory (CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>) before this command is invoked.

The arguments are:

<pot-file>

The path to the gettext Portable Object Template file (.pot) serving as the source for translations. If given as a relative path, it will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

ALL

Adds the generated target to the default CMake build target so that the files are built by default.

INSTALL_DESTINATION <destdir>

Specifies the installation directory for the generated .mo files at the install phase. If specified, files are installed to: <destdir>/<language>/LC_MESSAGES/<pot-base-filename>.mo. If not specified, files are not installed.

LANGUAGES <languages>...

A list of one or more translatable language locales (e.g., en_US, fr, de_DE, zh_CN, etc.).

gettext_create_translations

Creates a build rule that processes a given .pot template file and associated .po translation files into compiled Machine Object (.mo) files:

```
gettext_create_translations(<pot-file> [ALL] <po-files>...)
```

This command defines a custom target named translations that compiles the specified <pot-file> and <po-files> into binary .mo files. It also automatically adds an install rule for the generated .mo files, installing them into the default share/locale/<language>/LC_MESSAGES/<pot-base-filename>.mo path during the install phase.

The arguments are:

<pot-file>

The path to the gettext Portable Object Template file (.pot) serving as the source for translations. If given as a relative path, it will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

ALL

Adds the generated target to the default CMake build target so that translations are created by default during the build.

<po-files>...

A list of one or more translation source files in .po format, whose filenames must follow the format <language>.po. Relative paths will be interpreted relative to the current source directory (CMAKE_CURRENT_SOURCE_DIR <#variable:CMAKE_CURRENT_SOURCE_DIR>).

Note:

For better control over build and installation behavior, use gettext_process_po_files() instead.

### Deprecated Variables
The following variables are provided for backward compatibility:

GETTEXT_FOUND

Deprecated since version 4.2: Use Gettext_FOUND, which has the same value.

Boolean indicating whether (the requested version of) gettext was found.

GETTEXT_VERSION_STRING

Deprecated since version 4.2: Superseded by the Gettext_VERSION.

The version of gettext found.

### Examples: Finding gettext
Finding the GNU gettext tools:

```
find_package(Gettext)
```

Or, finding gettext and specifying a minimum required version:

```
find_package(Gettext 0.21)
```

Or, finding gettext and making it required (if not found, processing stops with an error message):

```
find_package(Gettext REQUIRED)
```

### Example: Working With gettext in CMake
When starting with gettext, .pot file is considered to be created manually. For example, using a xgettext tool on the provided main.cxx source code file:

main.cxx

```
#include <iostream>
#include <libintl.h>
#include <locale.h>
int main()
{

  // Set locale from environment

  setlocale(LC_ALL, "");

  // Bind the text domain

  const char* dir = std::getenv("TEXTDOMAINDIR");

  if (!dir) {

    dir = "/usr/local/share/locale";

  }

  bindtextdomain("MyApp", dir);

  textdomain("MyApp");

  std::cout << gettext("Hello, World") << std::endl;

  return 0;
}
```

The xgettext tool extracts all strings from gettext() calls in provided source code and creates translatable strings:

```
$ xgettext -o MyApp.pot main.cxx
```

Translatable files can be initialized by the project manually using msginit tool:

```
$ mkdir -p locale/de_DE
$ msginit -l de_DE.UTF8 -o locale/de_DE/MyApp.po -i MyApp.pot --no-translator
```

which creates a human-readable file that can be translated into a desired language (adjust as needed):

locale/de_DE/MyApp.po

```
msgid ""
msgstr ""
"Language: de\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Plural-Forms: nplurals=2; plural=(n != 1);\n"
msgid "Hello, World"
msgstr "Hallo, Welt"
```

In CMake, the gettext_process_po_files() command provided by this module automatically creates the needed .mo files that application loads at runtime depending on the system environment variables such as LANG. In the following example, also the GNUInstallDirs <#module:GNUInstallDirs> module is used to provide the CMAKE_INSTALL_LOCALEDIR variable:

CMakeLists.txt

```
cmake_minimum_required(VERSION 3.24)
project(GettextExample)
include(GNUInstallDirs)
find_package(Gettext)
if(Gettext_FOUND)

  foreach(language IN ITEMS de_DE)

    gettext_process_po_files(

      ${language}

      ALL

      PO_FILES locale/${language}/MyApp.po

      INSTALL_DESTINATION ${CMAKE_INSTALL_LOCALEDIR}

    )

  endforeach()
endif()
add_executable(example main.cxx)
# Find and link Intl library to use gettext() from libintl.h
find_package(Intl)
target_link_libraries(example PRIVATE Intl::Intl)
install(TARGETS example)
```

```
$ cmake -B build
$ cmake --build build
$ DESTDIR=$(pwd)/stage cmake --install build
```

To utilize the translations, the de_DE locale needs to be enabled on the system (see locale -a). And then the localized output can be run:

```
$ LANG=de_DE.UTF-8 TEXTDOMAINDIR=./stage/usr/local/share/locale \

  ./stage/usr/local/bin/example
```

### Example: Processing POT File
The gettext_process_pot_file() command processes .po translation files located in the current binary directory into .mo files:

CMakeLists.txt

```
find_package(Gettext)
if(Gettext_FOUND)

  set(languages de_DE fr zh_CN)

  foreach(language IN LISTS languages)

    configure_file(locale/${language}.po ${language}.po COPYONLY)

  endforeach()

  gettext_process_pot_file(

    MyApp.pot

    ALL

    INSTALL_DESTINATION ${CMAKE_INSTALL_LOCALEDIR}

    LANGUAGES ${languages}

  )
endif()
```

### Example: Creating Translations
Using a simplified gettext_create_translations() command to create .mo files:

CMakeLists.txt

```
find_package(Gettext)
if(Gettext_FOUND)

  gettext_create_translations(

    MyApp.pot

    ALL

    locale/de_DE.po

    locale/fr.po

    locale/zh_CN.po

  )
endif()
```

### See Also
•

The FindIntl <#module:FindIntl> module to find the Gettext runtime library (libintl).

### FindGIF
Finds the Graphics Interchange Format (GIF) library (giflib):

```
find_package(GIF [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GIF::GIF

Added in version 3.14.

Target that encapsulates the usage requirements of the GIF library, available when the library is found.

### Result Variables
This module defines the following variables:

GIF_FOUND

Boolean indicating whether the (requested version of) GIF library was found.

GIF_VERSION

Version string of the GIF library found (for example, 5.1.4). For GIF library versions prior to 4.1.6, version string will be set only to 3 or 4 as these versions did not provide version information in their headers.

GIF_INCLUDE_DIRS

Include directories needed to use the GIF library.

GIF_LIBRARIES

Libraries needed to link to the GIF library.

### Cache Variables
The following cache variables may also be set:

GIF_INCLUDE_DIR

Directory containing the gif_lib.h and other GIF library headers.

GIF_LIBRARY

Path to the GIF library.

### Hints
This module accepts the following variables:

GIF_DIR

Environment variable that can be set to help locate a GIF library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing GIF library: ./configure --prefix=$GIF_DIR.

### Examples
Finding GIF library and linking it to a project target:

```
find_package(GIF)
target_link_libraries(project_target PRIVATE GIF::GIF)
```

### FindGit
Finds the Git distributed version control system:

```
find_package(Git [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets> when the CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT:

Git::Git

Added in version 3.14.

Target that encapsulates Git command-line client executable. It can be used in generator expressions <#manual:cmake-generator-expressions(7)>, and commands like add_custom_target() <#command:add_custom_target> and add_custom_command() <#command:add_custom_command>. This target is available only if Git is found.

### Result Variables
This module defines the following variables:

Git_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Git was found.

Git_VERSION

Added in version 4.2.

The version of Git found.

### Cache Variables
The following cache variables may also be set:

GIT_EXECUTABLE

Path to the git command-line client executable.

### Deprecated Variables
The following variables are provided for backward compatibility:

GIT_FOUND

Deprecated since version 4.2: Use Git_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Git was found.

GIT_VERSION_STRING

Deprecated since version 4.2: Use Git_VERSION, which has the same value.

The version of Git found.

### Examples
Finding Git and retrieving the latest commit from the project repository:

```
find_package(Git)
if(Git_FOUND)

  execute_process(

    COMMAND ${GIT_EXECUTABLE} --no-pager log -n 1 HEAD "--pretty=format:%h %s"

    OUTPUT_VARIABLE output

    RESULT_VARIABLE result

    ERROR_QUIET

    OUTPUT_STRIP_TRAILING_WHITESPACE

  )

  if(result EQUAL 0)

    message(STATUS "Last Git commit: ${output}")

  endif()
endif()
```

### FindGLEW
Finds the OpenGL Extension Wrangler Library (GLEW):

```
find_package(GLEW [<version>] [...])
```

GLEW is a cross-platform C/C++ library that helps manage OpenGL extensions by providing efficient run-time mechanisms to query and load OpenGL functionality beyond the core specification.

Added in version 3.7: Debug and Release library variants are found separately.

Added in version 3.15: If GLEW is built using its CMake-based build system, it provides a CMake package configuration file (GLEWConfig.cmake). This module now takes that into account and first attempts to find GLEW in config mode. If the configuration file is not available, it falls back to module mode and searches standard locations.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GLEW::GLEW

Added in version 3.1.

The main imported target encapsulating the GLEW usage requirements, available if GLEW is found. It maps usage requirements of either GLEW::glew or GLEW::glew_s target depending on their availability.

GLEW::glew

Added in version 3.15.

Target encapsulating the usage requirements for a shared GLEW library. This target is available if GLEW is found and static libraries aren't requested via the GLEW_USE_STATIC_LIBS hint variable (see below).

GLEW::glew_s

Added in version 3.15.

Target encapsulating the usage requirements for a static GLEW library. This target is available if GLEW is found and the GLEW_USE_STATIC_LIBS hint variable is set to boolean true.

### Result Variables
This module defines the following variables:

GLEW_FOUND

Boolean indicating whether (the requested version of) GLEW was found.

GLEW_VERSION

Added in version 3.15.

The version of GLEW found.

GLEW_VERSION_MAJOR

Added in version 3.15.

The major version of GLEW found.

GLEW_VERSION_MINOR

Added in version 3.15.

The minor version of GLEW found.

GLEW_VERSION_MICRO

Added in version 3.15.

The micro version of GLEW found.

GLEW_INCLUDE_DIRS

Include directories needed to use GLEW library.

GLEW_LIBRARIES

Libraries needed to link against to use GLEW library (shared or static depending on configuration).

GLEW_SHARED_LIBRARIES

Added in version 3.15.

Libraries needed to link against to use shared GLEW library.

GLEW_STATIC_LIBRARIES

Added in version 3.15.

Libraries needed to link against to use static GLEW library.

### Hints
This module accepts the following variables before calling find_package(GLEW) to influence this module's behavior:

GLEW_USE_STATIC_LIBS

Added in version 3.15.

Set to boolean true to find static GLEW library and create the GLEW::glew_s imported target for static linkage.

GLEW_VERBOSE

Added in version 3.15.

Set to boolean true to output a detailed log of this module. Can be used, for example, for debugging.

### Examples
Finding GLEW and linking it to a project target:

```
find_package(GLEW)
target_link_libraries(project_target PRIVATE GLEW::GLEW)
```

Using the static GLEW library, if found:

```
set(GLEW_USE_STATIC_LIBS TRUE)
find_package(GLEW)
target_link_libraries(project_target PRIVATE GLEW::GLEW)
```

### FindGLUT
Finds the OpenGL Utility Toolkit (GLUT) library, which provides a simple API for creating windows, handling input, and managing events in OpenGL applications:

```
find_package(GLUT [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GLUT::GLUT

Added in version 3.1.

Target encapsulating the GLUT usage requirements, available if GLUT is found.

### Result Variables
This module defines the following variables:

GLUT_FOUND

Boolean indicating whether GLUT was found.

GLUT_INCLUDE_DIRS

Added in version 3.23.

Include directories needed to use GLUT. Starting with CMake 3.23, this variable is intended to be used in target usage requirements instead of the cache variable GLUT_INCLUDE_DIR, which is intended for finding GLUT.

GLUT_LIBRARIES

List of libraries needed to link against for using GLUT.

### Cache Variables
This module may set the following cache variables depending on platform. These variables may optionally be set to help this module find the correct files, but should not be used as result variables:

GLUT_INCLUDE_DIR

The full path to the directory containing GL/glut.h (without the GL/).

GLUT_glut_LIBRARY

The full path to the glut library.

GLUT_Xi_LIBRARY

The full path to the dependent Xi (X Input Device Extension) library on some systems.

GLUT_Xmu_LIBRARY

The full path to the dependent Xmu (X Miscellaneous Utilities) library on some systems.

### Examples
Finding GLUT and linking it to a project target:

```
find_package(GLUT)
target_link_libraries(project_target PRIVATE GLUT::GLUT)
```

### FindGnuplot
Finds the Gnuplot command-line graphing utility for generating two- and three-dimensional plots (gnuplot):

```
find_package(Gnuplot [<version>] [...])
```

### Result Variables
This module defines the following variables:

Gnuplot_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Gnuplot was found.

Gnuplot_VERSION

Added in version 4.2.

The version of Gnuplot found.

Note:

Version detection is available only for Gnuplot 4 and later. Earlier versions did not provide version output.

### Cache Variables
The following cache variables may also be set:

GNUPLOT_EXECUTABLE

Absolute path to the gnuplot executable.

### Deprecated Variables
The following variables are provided for backward compatibility:

GNUPLOT_FOUND

Deprecated since version 4.2: Use Gnuplot_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Gnuplot was found.

GNUPLOT_VERSION_STRING

Deprecated since version 4.2: Superseded by the Gnuplot_VERSION.

The version of Gnuplot found.

### Examples
Finding Gnuplot and executing it in a process:

```
find_package(Gnuplot)
if(Gnuplot_FOUND)

  execute_process(COMMAND ${GNUPLOT_EXECUTABLE} --help)
endif()
```

### FindGnuTLS
Finds the GNU Transport Layer Security library (GnuTLS):

```
find_package(GnuTLS [<version>] [...])
```

The GnuTLS package includes the main libraries (libgnutls and libdane), as well as the optional gnutls-openssl compatibility extra library. They are all distributed as part of the same release. This module checks for the presence of the main libgnutls library and provides usage requirements for integrating GnuTLS into CMake projects.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GnuTLS::GnuTLS

Added in version 3.16.

Target encapsulating the GnuTLS usage requirements, available if GnuTLS is found.

### Result Variables
This module defines the following variables:

GnuTLS_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) GnuTLS was found.

GnuTLS_VERSION

Added in version 4.2.

The version of GnuTLS found.

GNUTLS_INCLUDE_DIRS

Include directories needed to use GnuTLS.

GNUTLS_LIBRARIES

Libraries needed to link against to use GnuTLS.

GNUTLS_DEFINITIONS

Compiler options required for using GnuTLS.

### Cache Variables
The following cache variables may also be set:

GNUTLS_INCLUDE_DIR

The directory containing the gnutls/gnutls.h header file.

GNUTLS_LIBRARY

The path to the GnuTLS library.

### Deprecated Variables
The following variables are provided for backward compatibility:

GNUTLS_FOUND

Deprecated since version 4.2: Use GnuTLS_FOUND, which has the same value.

Boolean indicating whether (the requested version of) GnuTLS was found.

GNUTLS_VERSION_STRING

Deprecated since version 3.16: Use the GnuTLS_VERSION, which has the same value.

GNUTLS_VERSION

Added in version 3.16.

Deprecated since version 4.2: Use the GnuTLS_VERSION, which has the same value.

### Examples
Finding GnuTLS and linking it to a project target:

```
find_package(GnuTLS)
target_link_libraries(project_target PRIVATE GnuTLS::GnuTLS)
```

### FindGSL
Added in version 3.2.

Finds the native GNU Scientific Library (GSL) includes and libraries:

```
find_package(GSL [<version>] [...])
```

The GNU Scientific Library (GSL) is a numerical library for C and C++ programmers. It is free software under the GNU General Public License.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GSL::gsl

Target encapsulating the main GSL library and all usage requirements, available only if GSL is found.

GSL::gslcblas

Target encapsulating the usage requirements of the CBLAS support library used by GSL. This target is available if GSL is found. It is linked also into the GSL::gsl target but provided separately for granularity.

### Result Variables
This module defines the following variables:

GSL_FOUND

Boolean indicating whether (the requested version of) GSL was found on the local system.

GSL_VERSION

The version of the discovered GSL installation.

GSL_INCLUDE_DIRS

Directory containing GSL header files.

GSL_LIBRARIES

The GSL libraries.

### Cache Variables
This module may set the following variables depending on platform and type of GSL installation discovered. These variables may optionally be set to help this module find the correct files:

GSL_CBLAS_LIBRARY

Location of the GSL CBLAS library.

GSL_CBLAS_LIBRARY_DEBUG

Location of the debug GSL CBLAS library (if any).

GSL_CONFIG_EXECUTABLE

Location of the gsl-config script (if any).

GSL_LIBRARY

Location of the GSL library.

GSL_LIBRARY_DEBUG

Location of the debug GSL library (if any).

### Hints
This module accepts the following variables:

GSL_ROOT_DIR

Set this variable to a directory that contains a GSL installation. If this variable is not set, this module will use pkg-config and default paths to find GSL. If this variable is provided, then this module expects to find libraries at ${GSL_ROOT_DIR}/lib and the GSL headers at ${GSL_ROOT_DIR}/include/gsl.

The library directory may optionally provide Release and Debug folders. If available, the libraries named gsld, gslblasd or cblasd are recognized as debug libraries. For Unix-like systems, this module will also use gsl-config (if found) to aid in the discovery of GSL.

### Examples
Finding GSL and linking it to a project target:

```
find_package(GSL)
target_link_libraries(project_target PRIVATE GSL::gsl)
```

### FindGTest
Finds GoogleTest, the Google C++ testing and mocking framework:

```
find_package(GTest [...])
```

The GoogleTest framework also includes GoogleMock, a library for writing and using C++ mock classes. On some systems, GoogleMock may be distributed as a separate package.

When both debug and release (optimized) variants of the GoogleTest and GoogleMock libraries are available, this module selects the appropriate variants based on the current Build Configuration <#build-configurations>.

Added in version 3.20: If GoogleTest is built and installed using its CMake-based build system, it provides a package configuration file <#config-file-packages> (GTestConfig.cmake) that can be used with find_package() <#command:find_package> in Config mode <#config-mode>. By default, this module now searches for that configuration file and, if found, returns the results without further action. If the upstream configuration file is not found, this module falls back to Module mode <#module-mode> and searches standard locations.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GTest::gtest

Added in version 3.20.

Target encapsulating the usage requirements of the GoogleTest gtest library, available if GoogleTest is found. The gtest library provides the core GoogleTest testing framework functionality.

GTest::gtest_main

Added in version 3.20.

Target encapsulating the usage requirements of the GoogleTest gtest_main library, available if GoogleTest is found. The gtest_main library provides a main() function, allowing tests to be run without defining one manually.

Only link to GTest::gtest_main if GoogleTest should supply the main() function for the executable. If the project is supplying its own main() implementation, link only to GTest::gtest.

GTest::gmock

Added in version 3.23.

Target encapsulating the usage requirements of the GoogleMock gmock library, available if GoogleTest and its Mock library are found. The gmock library provides facilities for writing and using mock classes in C++.

GTest::gmock_main

Added in version 3.23.

Target encapsulating the usage requirements of the GoogleMock gmock_main library, available if GoogleTest and gmock_main are found. The gmock_main library provides a main() function, allowing GoogleMock tests to be run without defining one manually.

Only link to GTest::gmock_main if GoogleTest should supply the main() function for the executable. If project is supplying its own main() implementation, link only to GTest::gmock.

### Result Variables
This module defines the following variables:

GTest_FOUND

Added in version 3.3.

Boolean indicating whether GoogleTest was found.

### Hints
This module accepts the following variables before calling find_package(GTest):

GTEST_ROOT

The root directory of the GoogleTest installation (may also be set as an environment variable). This variable is used only when GoogleTest is found in Module mode <#module-mode>.

GTEST_MSVC_SEARCH

When compiling with MSVC, this variable controls which GoogleTest build variant to search for, based on the runtime library linkage model. This variable is used only when GoogleTest is found in Module mode <#module-mode> and accepts one of the following values:

MD

(Default) Searches for shared library variants of GoogleTest that are built to link against the dynamic C runtime. These libraries are typically compiled with the MSVC runtime flags /MD or /MDd (for Release or Debug, respectively).

MT

Searches for static library variants of GoogleTest that are built to link against the static C runtime. These libraries are typically compiled with the MSVC runtime flags /MT or /MTd.

### Deprecated Variables
The following variables are provided for backward compatibility:

GTEST_INCLUDE_DIRS

Deprecated since version 4.1: Use the GTest::gtest imported target instead, which exposes the required include directories through its INTERFACE_INCLUDE_DIRECTORIES <#prop_tgt:INTERFACE_INCLUDE_DIRECTORIES> target property.

Result variable that provides include directories containing headers needed to use GoogleTest. This variable is only guaranteed to be available when GoogleTest is found in Module mode <#module-mode>.

GTEST_LIBRARIES

Deprecated since version 4.1: Use the GTest::gtest imported target instead.

Result variable providing libraries needed to link against to use the GoogleTest gtest library. Note that projects are also responsible for linking with an appropriate thread library in addition to the libraries specified by this variable.

GTEST_MAIN_LIBRARIES

Deprecated since version 4.1: Use the GTest::gtest_main imported target instead.

Result variable providing libraries needed to link against to use the GoogleTest gtest_main library.

GTEST_BOTH_LIBRARIES

Deprecated since version 4.1: Use the GTest::gtest and GTest::gtest_main imported targets instead.

Result variable providing both gtest and gtest_main libraries combined.

GTEST_FOUND

Deprecated since version 4.2: Use GTest_FOUND, which has the same value.

Boolean indicating whether GoogleTest was found.

### Deprecated Imported Targets
For backward compatibility, this module also provides the following imported targets (available since CMake 3.5):

GTest::GTest

Deprecated since version 3.20: Use the GTest::gtest imported target instead.

Imported target linking the GTest::gtest library.

GTest::Main

Deprecated since version 3.20: Use the GTest::gtest_main imported target instead.

Imported target linking the GTest::gtest_main library.

### Examples: Finding GoogleTest
Finding GoogleTest:

```
find_package(GoogleTest)
```

Or, finding GoogleTest and making it required (if not found, processing stops with an error message):

```
find_package(GoogleTest REQUIRED)
```

### Examples: Using Imported Targets
In the following example, the GTest::gtest imported target is linked to a project target, which enables using the core GoogleTest testing framework:

```
find_package(GTest REQUIRED)
target_link_libraries(foo PRIVATE GTest::gtest)
```

In the next example, the GTest::gtest_main imported target is also linked to the executable, and a test is registered. The GTest::gtest_main library provides a main() function, so there is no need to write one manually. The GTest::gtest library is still linked because the test code directly uses things provided by GTest::gtest, and good practice is to link directly to libraries used directly.

```
enable_testing()
find_package(GTest REQUIRED)
add_executable(foo foo.cc)
target_link_libraries(foo PRIVATE GTest::gtest GTest::gtest_main)
add_test(NAME AllTestsInFoo COMMAND foo)
```

### Deeper Integration With CTest
This module is commonly used with the GoogleTest <#module:GoogleTest> module, which provides gtest_discover_tests() <#command:gtest_discover_tests> and gtest_add_tests() <#command:gtest_add_tests> commands to help integrate GoogleTest infrastructure with CTest:

```
find_package(GTest)
target_link_libraries(example PRIVATE GTest::gtest GTest::gtest_main)
include(GoogleTest)
gtest_discover_tests(example)
# ...
```

Changed in version 3.9: Previous CMake versions defined the gtest_add_tests() <#command:gtest_add_tests> command in this module.

### FindGTK
Note:

This module works only on Unix-like systems and was intended for early GTK branch of 1.x, which is no longer maintained. Use the latest supported GTK version and FindPkgConfig <#module:FindPkgConfig> module to find GTK in CMake instead of this module. For example:

```
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk4>=4.14)
target_link_libraries(example PRIVATE PkgConfig::GTK)
```

Finds GTK, glib and GTKGLArea:

```
find_package(GTK [...])
```

GTK is a multi-platform toolkit for creating graphical user interfaces.

### Result Variables
This module defines the following variables:

GTK_FOUND

Boolean indicating whether GTK was found.

GTK_GL_FOUND

Boolean indicating whether GTK's GL features were found.

GTK_INCLUDE_DIR

Include directories containing headers needed to use GTK.

GTK_LIBRARIES

Libraries needed to link against for using GTK.

### Examples
Finding GTK 1.x and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(GTK)
if(GTK_FOUND)

  add_library(GTK::GTK INTERFACE IMPORTED)

  set_target_properties(

    GTK::GTK

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${GTK_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${GTK_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE GTK::GTK)
```

### See Also
•

The FindGTK2 <#module:FindGTK2> module to find GTK version 2.

### FindGTK2
Note:

This module is intended specifically for GTK version 2.x, which is obsolete and no longer maintained. Use the latest supported GTK version and FindPkgConfig <#module:FindPkgConfig> module to find GTK in CMake instead of this module. For example:

```
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk4>=4.14)
target_link_libraries(example PRIVATE PkgConfig::GTK)
```

Finds the GTK widget libraries and several of its other optional components:

```
find_package(GTK2 [<version>] [COMPONENTS <components>...] [...])
```

GTK is a multi-platform toolkit for creating graphical user interfaces.

### Components
This module supports optional components, which can be specified with the find_package() <#command:find_package> command:

```
find_package(GTK2 [COMPONENTS <components>...])
```

Supported components include:

- atk

- atkmm

- cairo

- cairomm

- gdk_pixbuf

- gdk

- gdkmm

- gio

- giomm

- glade

- glademm

- glib

- glibmm

- gmodule

- gobject

- gthread

- gtk

- gtkmm

- pango

- pangocairo

- pangoft2

- pangomm

- pangoxft

- sigc

•

Added in version 3.16.7: harfbuzz

If no components are specified, module by default searches for the gtk component.

### Imported Targets
This module provides the following Imported Targets <#imported-targets> (subject to component selection):

GTK2::<component>

Target encapsulating the specified GTK component usage requirements, available if GTK and this component are found. The <component> should be written in the same case, as listed above. For example, use GTK2::gtk for the gtk component, or GTK2::gdk_pixbuf for the gdk_pixbuf component, etc.

GTK2::sigc++

Added in version 3.5.

Target encapsulating the usage requirements to enable c++11 on its dependents when using sigc++ 2.5.1 or higher. This target is automatically applied to dependent targets as needed.

### Result Variables
This module defines the following variables:

GTK2_FOUND

Boolean indicating whether (the requested version of) GTK 2 and all specified components were found.

GTK2_VERSION

The version of GTK found (x.y.z).

GTK2_MAJOR_VERSION

The major version of GTK found.

GTK2_MINOR_VERSION

The minor version of GTK found.

GTK2_PATCH_VERSION

The patch version of GTK found.

GTK2_INCLUDE_DIRS

Include directories containing headers needed to use GTK.

GTK2_LIBRARIES

Libraries needed to link against to use GTK.

GTK2_TARGETS

Added in version 3.5.

A list of all defined imported targets.

GTK2_DEFINITIONS

Additional compiler flags needed to use GTK.

### Input Variables
This module accepts the following optional variables before calling the find_package(GTK2):

GTK2_DEBUG

Boolean variable that enables verbose debugging output of this module.

GTK2_ADDITIONAL_SUFFIXES

A list of additional path suffixes to search for include files.

GTK2_USE_IMPORTED_TARGETS

Added in version 3.5.

When this variable is set to boolean true, GTK2_LIBRARIES variable will contain a list imported targets instead of library paths.

### Examples: Finding GTK version 2
Call find_package() <#command:find_package> once. Here are some examples to pick from.

Require GTK 2.6 or later:

```
find_package(GTK2 2.6 REQUIRED COMPONENTS gtk)
```

Require GTK 2.10 or later and its Glade component:

```
find_package(GTK2 2.10 REQUIRED COMPONENTS gtk glade)
```

Search for GTK/GTKMM 2.8 or later:

```
find_package(GTK2 2.8 COMPONENTS gtk gtkmm)
```

Finding GTK 2 and linking it to a project target:

```
find_package(GTK2)
add_executable(mygui mygui.cc)
target_link_libraries(mygui PRIVATE GTK2::gtk)
```

### Examples: Finding GTK version 3 or later
Finding GTK 3 with FindPkgConfig <#module:FindPkgConfig> instead of this module:

```
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK3 REQUIRED IMPORTED_TARGET gtk+-3.0>=3.14)
target_link_libraries(example PRIVATE PkgConfig::GTK3)
```

Or similarly to find GTK 4:

```
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK4 REQUIRED IMPORTED_TARGET gtk4>=4.14)
target_link_libraries(example PRIVATE PkgConfig::GTK4)
```

### FindHDF5
Finds Hierarchical Data Format (HDF5), a library for reading and writing self-describing array data:

```
find_package(HDF5 [<version>] [COMPONENTS <components>...] [...])
```

If the HDF5 library is built using its CMake-based build system, it will as of HDF5 version 1.8.15 provide its own CMake Package Configuration file (hdf5-config.cmake) for use with the find_package() <#command:find_package> command in config mode. By default, this module searches for this file and, if found, returns the results based on the found configuration.

If the upstream configuration file is not found, this module falls back to module mode and invokes the HDF5 wrapper compiler typically installed with the HDF5 library. Depending on the configuration, this wrapper compiler is named either h5cc (serial) or h5pcc (parallel). If found, the wrapper is queried with the -show argument to determine the compiler and linker flags required for building an HDF5 client application. Both serial and parallel versions of the HDF5 wrapper are considered. The first directory containing either is used. If both versions are found in the same directory, the serial version is preferred by default. To change this behavior, set the variable HDF5_PREFER_PARALLEL to TRUE.

In addition to finding the include directories and libraries needed to compile an HDF5 application, this module also attempts to find additional tools provided by the HDF5 distribution, which can be useful for regression testing or development workflows.

### Components
This module supports optional components, which can be specified with the find_package() <#command:find_package> command:

```
find_package(HDF5 [COMPONENTS <components>...])
```

Supported components include:

C

Finds the HDF5 C library (C bindings).

CXX

Finds the HDF5 C++ library (C++ bindings).

Fortran

Finds the HDF5 Fortran library (Fortran bindings).

HL

This component can be used in combination with other components to find the high-level (HL) HDF5 library variants for C, CXX, and/or Fortran, which provide high-level functions.

If no components are specified, then this module will by default search for the C component.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

HDF5::HDF5

Added in version 3.19.

Target encapsulating the usage requirements for all found HDF5 binding libraries (HDF5_LIBRARIES), available if HDF5 and all required components are found.

hdf5::hdf5

Added in version 3.19.

Target encapsulating the usage requirements for the HDF5 C library, available if HDF5 library and its C component are found.

hdf5::hdf5_cpp

Added in version 3.19.

Target encapsulating the usage requirements for the HDF5 C and C++ libraries, available if HDF5 library, and its C and CXX components are found.

hdf5::hdf5_fortran

Added in version 3.19.

Target encapsulating the usage requirements for the HDF5 Fortran library, available if HDF5 library and its Fortran component are found.

hdf5::hdf5_hl

Added in version 3.19.

Target encapsulating the usage requirements for the HDF5 high-level C library, available if HDF5 library and its C, and HL components are found.

hdf5::hdf5_hl_cpp

Added in version 3.19.

High-level C++ library.

Target encapsulating the usage requirements for the HDF5 high-level C and high-level C++ libraries, available if HDF5 library and its C, CXX, and HL components are found.

hdf5::hdf5_hl_fortran

Added in version 3.19.

Target encapsulating the usage requirements for the HDF5 high-level Fortran library, available if HDF5 library and its Fortran, and HL components are found.

hdf5::h5diff

Added in version 3.19.

Imported executable target encapsulating the usage requirements for the h5diff executable, available if h5diff is found.

### Result Variables
This module defines the following variables:

HDF5_FOUND

Boolean indicating whether (the requested version of) HDF5 was found.

HDF5_VERSION

Added in version 3.3.

The version of HDF5 library found.

HDF5_INCLUDE_DIRS

Include directories containing header files needed to use HDF5.

HDF5_DEFINITIONS

Required compiler definitions for using HDF5.

HDF5_LIBRARIES

Libraries of all requested bindings needed to link against to use HDF5.

HDF5_HL_LIBRARIES

Required libraries for the HDF5 high-level API for all bindings, if the HL component is enabled.

HDF5_IS_PARALLEL

Boolean indicating whether the HDF5 library has parallel IO support.

For each enabled language binding component, a corresponding HDF5_<LANG>_LIBRARIES variable, and potentially HDF5_<LANG>_DEFINITIONS, will be defined. If the HL component is enabled, then HDF5_<LANG>_HL_LIBRARIES variables will also be defined:

HDF5_C_DEFINITIONS

Required compiler definitions for HDF5 C bindings.

HDF5_CXX_DEFINITIONS

Required compiler definitions for HDF5 C++ bindings.

HDF5_Fortran_DEFINITIONS

Required compiler definitions for HDF5 Fortran bindings.

HDF5_C_INCLUDE_DIRS

Required include directories for HDF5 C bindings.

HDF5_CXX_INCLUDE_DIRS

Required include directories for HDF5 C++ bindings.

HDF5_Fortran_INCLUDE_DIRS

Required include directories for HDF5 Fortran bindings.

HDF5_C_LIBRARIES

Required libraries for the HDF5 C bindings.

HDF5_CXX_LIBRARIES

Required libraries for the HDF5 C++ bindings.

HDF5_Fortran_LIBRARIES

Required libraries for the HDF5 Fortran bindings.

HDF5_C_HL_LIBRARIES

Required libraries for the high-level C bindings, if the HL component is enabled.

HDF5_CXX_HL_LIBRARIES

Required libraries for the high-level C++ bindings, if the HL component is enabled.

HDF5_Fortran_HL_LIBRARIES

Required libraries for the high-level Fortran bindings, if the HL component is enabled.

### Cache Variables
The following cache variables may also be set:

HDF5_C_COMPILER_EXECUTABLE

The path to the HDF5 C wrapper compiler.

HDF5_CXX_COMPILER_EXECUTABLE

The path to the HDF5 C++ wrapper compiler.

HDF5_Fortran_COMPILER_EXECUTABLE

The path to the HDF5 Fortran wrapper compiler.

HDF5_C_COMPILER_EXECUTABLE_NO_INTERROGATE

Added in version 3.6.

The path to the primary C compiler which is also the HDF5 wrapper. This variable is used only in module mode.

HDF5_CXX_COMPILER_EXECUTABLE_NO_INTERROGATE

Added in version 3.6.

The path to the primary C++ compiler which is also the HDF5 wrapper. This variable is used only in module mode.

HDF5_Fortran_COMPILER_EXECUTABLE_NO_INTERROGATE

Added in version 3.6.

The path to the primary Fortran compiler which is also the HDF5 wrapper. This variable is used only in module mode.

HDF5_DIFF_EXECUTABLE

The path to the HDF5 dataset comparison tool (h5diff).

### Hints
The following variables can be set before calling the find_package(HDF5) to guide the search for HDF5 library:

HDF5_PREFER_PARALLEL

Added in version 3.4.

Set this to boolean true to prefer parallel HDF5 (by default, serial is preferred). This variable is used only in module mode.

HDF5_FIND_DEBUG

Added in version 3.9.

Set this to boolean true to get extra debugging output by this module.

HDF5_NO_FIND_PACKAGE_CONFIG_FILE

Added in version 3.8.

Set this to boolean true to skip finding and using CMake package configuration file (hdf5-config.cmake).

HDF5_USE_STATIC_LIBRARIES

Set this to boolean value to determine whether or not to prefer a static link to a dynamic link for HDF5 and all of its dependencies. Added in version 3.10: Support for HDF5_USE_STATIC_LIBRARIES on Windows.

### Examples: Finding HDF5
Finding HDF5:

```
find_package(HDF5)
```

Specifying a minimum required version of HDF5 to find:

```
find_package(HDF5 1.8.15)
```

Finding HDF5 and making it required (if HDF5 is not found, processing stops with an error message):

```
find_package(HDF5 1.8.15 REQUIRED)
```

Searching for static HDF5 libraries:

```
set(HDF5_USE_STATIC_LIBRARIES TRUE)
find_package(HDF5)
```

Specifying components to find high-level C and C++ functions:

```
find_package(HDF5 COMPONENTS C CXX HL)
```

### Examples: Using HDF5
Finding HDF5 and linking it to a project target:

```
find_package(HDF5)
target_link_libraries(project_target PRIVATE HDF5::HDF5)
```

Using Fortran HDF5 and HDF5-HL functions:

```
find_package(HDF5 COMPONENTS Fortran HL)
target_link_libraries(project_target PRIVATE HDF5::HDF5)
```

### FindHg
Finds the Mercurial command-line client executable (hg) and provides a command for extracting information from a Mercurial working copy:

```
find_package(Hg [<version>] [...])
```

### Result Variables
This module defines the following variables:

Hg_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Mercurial client was found.

Hg_VERSION

Added in version 4.2.

The version of Mercurial found.

### Cache Variables
The following cache variables may also be set:

HG_EXECUTABLE

Absolute path to the Mercurial command-line client (hg).

### Commands
This module provides the following command when Mercurial client (hg) is found:

Hg_WC_INFO

Added in version 3.1.

Extracts information of a Mercurial working copy:

```
Hg_WC_INFO(<dir> <var-prefix>)
```

This command defines the following variables if running Mercurial client on working copy located at a given location <dir> succeeds; otherwise a SEND_ERROR message is generated:

<var-prefix>_WC_CHANGESET

Current changeset.

<var-prefix>_WC_REVISION

Current revision.

### Deprecated Variables
The following variables are provided for backward compatibility:

HG_FOUND

Deprecated since version 4.2: Use Hg_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Mercurial client was found.

HG_VERSION_STRING

Deprecated since version 4.2: Use Hg_VERSION, which has the same value.

The version of Mercurial found.

### Examples
Finding the Mercurial client and retrieving information about the current project's working copy:

```
find_package(Hg)
if(Hg_FOUND)

  Hg_WC_INFO(${PROJECT_SOURCE_DIR} Project)

  message("Current revision is ${Project_WC_REVISION}")

  message("Current changeset is ${Project_WC_CHANGESET}")
endif()
```

### FindHSPELL
Finds the Hebrew spell-checker and morphology engine (Hspell):

```
find_package(HSPELL [<version>] [...])
```

### Result Variables
This module defines the following variables:

HSPELL_FOUND

Boolean indicating whether (the requested version of) Hspell was found.

HSPELL_VERSION

Added in version 4.2.

The version of Hspell found (x.y).

HSPELL_VERSION_MAJOR

The major version of Hspell found.

HSPELL_VERSION_MINOR

The minor version of Hspell found.

### Cache Variables
The following cache variables may also be set:

HSPELL_INCLUDE_DIR

The Hspell include directory.

HSPELL_LIBRARIES

The libraries needed to use Hspell.

### Deprecated Variables
The following variables are provided for backward compatibility:

HSPELL_VERSION_STRING

Deprecated since version 4.2: Use HSPELL_VERSION, which has the same value.

The version of Hspell found (x.y).

### Examples
Finding Hspell:

```
find_package(HSPELL)
```

### FindHTMLHelp
Finds the Microsoft HTML Help Compiler and its API which is part of the HTML Help Workshop:

```
find_package(HTMLHelp [...])
```

Note:

HTML Help Workshop is in maintenance mode only and is considered deprecated. For modern documentation, consider alternatives such as Microsoft Help Viewer for producing .mshc files or web-based documentation tools.

### Result Variables
This module defines the following variables:

HTMLHelp_FOUND

Added in version 4.2.

Boolean indicating whether HTML Help was found.

### Cache Variables
The following cache variables may also be set:

HTML_HELP_COMPILER

Full path to the HTML Help Compiler (hhc.exe), used to compile .chm files.

HTML_HELP_INCLUDE_PATH

Directory containing htmlhelp.h, required for applications integrating the HTML Help API.

HTML_HELP_LIBRARY

Full path to htmlhelp.lib library, required for linking applications that use the HTML Help API.

### Examples
Finding HTML Help Compiler:

```
find_package(HTMLHelp)
message(STATUS "HTML Help Compiler found at: ${HTML_HELP_COMPILER}")
```

### FindIce
Added in version 3.1.

Finds the Internet Communication Engine (Ice) programs, libraries and datafiles:

```
find_package(Ice [<version>] COMPONENTS <components>... [...])
```

Ice is an open-source remote procedure call (RPC) framework developed by ZeroC and provides SDKs for various languages to develop network applications.

Added in version 3.4: Imported targets for components and many new *_EXECUTABLE variables.

Added in version 3.7: Debug and Release library variants are found separately.

Added in version 3.10: Ice 3.7 support, including new components, programs and the Nuget package.

### Components
Ice consists of several libraries and programs (executables). This find module supports components, which can be specified using the find_package() <#command:find_package> command, to select specific Ice libraries for use in a CMake project. Executables provided by Ice installation are always searched automatically, regardless of the specified components.

The list of available components depends on the Ice version in use. To successfully find Ice, at least one component must be specified:

```
find_package(Ice COMPONENTS <components>...)
```

Supported components include:

- Freeze

- Glacier2

- Ice

- IceBox

- IceDB

- IceDiscovery

- IceGrid

- IceLocatorDiscovery

- IcePatch

- IceSSL

- IceStorm

- IceUtil

- IceXML

- Slice

Ice 3.7 and later also include C++11-specific components:

- Glacier2++11

- Ice++11

- IceBox++11

- IceDiscovery++11

- IceGrid++11

- IceLocatorDiscovery++11

- IceSSL++11

- IceStorm++11

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Ice::<component>

Added in version 3.4.

Target encapsulating the usage requirements for the specified Ice component (library), available if that component is found. The <component> should be written in the same case, as listed above. For example, use Ice::Glacier2 for the Ice Glacier2 library, or Ice::Ice++11 for the Ice++11 library, etc.

### Result Variables
This module defines the following variables:

Ice_FOUND

Boolean indicating whether the (requested version of) main programs, libraries and all requested components for using Ice were found.

Ice_VERSION

The version of Ice release found.

Ice_INCLUDE_DIRS

The include directories containing headers needed to use Ice.

Ice_LIBRARIES

Component libraries needed to link against to use Ice.

Ice_SLICE_DIRS

The data directories containing interface definitions (*.ice files) for Slice (Specification Language for Ice).

Ice component libraries are stored in:

Ice_<COMPONENT>_FOUND

Boolean indicating whether the specified Ice component was found. The <COMPONENT> should be written in uppercase.

Ice_<COMPONENT>_LIBRARIES

Libraries provided by the specified Ice component. The <COMPONENT> should be written in uppercase.

Slice programs are stored in:

Ice_SLICE2CONFLUENCE_EXECUTABLE

Added in version 3.14.

The path to the slice2confluence executable.

Ice_SLICE2CPP_EXECUTABLE

The path to the slice2cpp executable.

Ice_SLICE2CS_EXECUTABLE

The path to the slice2cs executable.

Ice_SLICE2FREEZEJ_EXECUTABLE

The path to the slice2freezej executable.

Ice_SLICE2FREEZE_EXECUTABLE

The path to the slice2freeze executable.

Ice_SLICE2HTML_EXECUTABLE

The path to the slice2html executable.

Ice_SLICE2JAVA_EXECUTABLE

The path to the slice2java executable.

Ice_SLICE2JS_EXECUTABLE

Added in version 3.4.

The path to the slice2js executable.

Ice_SLICE2MATLAB_EXECUTABLE

Added in version 3.14.

The path to the slice2matlab executable.

Ice_SLICE2OBJC_EXECUTABLE

Added in version 3.10.

The path to the slice2objc executable.

Ice_SLICE2PHP_EXECUTABLE

The path to the slice2php executable.

Ice_SLICE2PY_EXECUTABLE

The path to the slice2py executable.

Ice_SLICE2RB_EXECUTABLE

The path to the slice2rb executable.

Ice programs are stored in:

Ice_GLACIER2ROUTER_EXECUTABLE

Added in version 3.4.

The path to the glacier2router executable.

Ice_ICEBOX_EXECUTABLE

Added in version 3.4.

The path to the icebox executable.

Ice_ICEBOX++11_EXECUTABLE

Added in version 3.10.

The path to the icebox++11 executable.

Ice_ICEBOXADMIN_EXECUTABLE

Added in version 3.4.

The path to the iceboxadmin executable.

Ice_ICEBOXD_EXECUTABLE

Added in version 3.4.

The path to the iceboxd executable.

Ice_ICEBOXNET_EXECUTABLE

Added in version 3.4.

The path to the iceboxnet executable.

Ice_ICEBRIDGE_EXECUTABLE

Added in version 3.10.

The path to the icebridge executable.

Ice_ICEGRIDADMIN_EXECUTABLE

Added in version 3.4.

The path to the icegridadmin executable.

Ice_ICEGRIDDB_EXECUTABLE

Added in version 3.10.

The path to the icegriddb executable.

Ice_ICEGRIDNODE_EXECUTABLE

Added in version 3.4.

The path to the icegridnode executable.

Ice_ICEGRIDNODED_EXECUTABLE

Added in version 3.4.

The path to the icegridnoded executable.

Ice_ICEGRIDREGISTRY_EXECUTABLE

Added in version 3.4.

The path to the icegridregistry executable.

Ice_ICEGRIDREGISTRYD_EXECUTABLE

Added in version 3.4.

The path to the icegridregistryd executable.

Ice_ICEPATCH2CALC_EXECUTABLE

The path to the icepatch2calc executable.

Ice_ICEPATCH2CLIENT_EXECUTABLE

Added in version 3.4.

The path to the icepatch2client executable.

Ice_ICEPATCH2SERVER_EXECUTABLE

Added in version 3.4.

The path to the icepatch2server executable.

Ice_ICESERVICEINSTALL_EXECUTABLE

Added in version 3.4.

The path to the iceserviceinstall executable.

Ice_ICESTORMADMIN_EXECUTABLE

Added in version 3.4.

The path to the icestormadmin executable.

Ice_ICESTORMDB_EXECUTABLE

Added in version 3.10.

The path to the icestormdb executable.

Ice_ICESTORMMIGRATE_EXECUTABLE

Added in version 3.4.

The path to the icestormmigrate executable.

Ice database programs are stored in the following variables (on Windows, they are included with the Ice installation; on other platforms, they are usually available through standard Berkeley DB packages):

Ice_DB_ARCHIVE_EXECUTABLE

Added in version 3.4.

The path to the db_archive executable.

Ice_DB_CHECKPOINT_EXECUTABLE

Added in version 3.4.

The path to the db_checkpoint executable.

Ice_DB_DEADLOCK_EXECUTABLE

Added in version 3.4.

The path to the db_deadlock executable.

Ice_DB_DUMP_EXECUTABLE

Added in version 3.4.

The path to the db_dump executable.

Ice_DB_HOTBACKUP_EXECUTABLE

Added in version 3.4.

The path to the db_hotbackup executable.

Ice_DB_LOAD_EXECUTABLE

Added in version 3.4.

The path to the db_load executable.

Ice_DB_LOG_VERIFY_EXECUTABLE

Added in version 3.4.

The path to the db_log_verify executable.

Ice_DB_PRINTLOG_EXECUTABLE

Added in version 3.4.

The path to the db_printlog executable.

Ice_DB_RECOVER_EXECUTABLE

Added in version 3.4.

The path to the db_recover executable.

Ice_DB_STAT_EXECUTABLE

Added in version 3.4.

The path to the db_stat executable.

Ice_DB_TUNER_EXECUTABLE

Added in version 3.4.

The path to the db_tuner executable.

Ice_DB_UPGRADE_EXECUTABLE

Added in version 3.4.

The path to the db_upgrade executable.

Ice_DB_VERIFY_EXECUTABLE

Added in version 3.4.

The path to the db_verify executable.

Ice_DUMPDB_EXECUTABLE

Added in version 3.4.

The path to the dumpdb executable.

Ice_TRANSFORMDB_EXECUTABLE

Added in version 3.4.

The path to the transformdb executable.

### Cache Variables
The following cache variables may also be set:

Ice_<PROGRAM>_EXECUTABLE

The path to the specified <PROGRAM> executable; The <PROGRAM> is the uppercase name of the Ice program as listed in above result variables of executables.

Ice_INCLUDE_DIR

The directory containing Ice headers.

Ice_SLICE_DIR

The data directory containing interface definitions for Slice.

Ice_<COMPONENT>_LIBRARY

The path to the library for the specified component. The <COMPONENT> should be written in uppercase.

### Hints
This module accepts the following variables:

Ice_HOME

Set this CMake variable to the root of the Ice installation in order to search for Ice in a custom location. Note:

On Windows, Ice 3.7.0 and later provide libraries via the NuGet package manager. Appropriate NuGet packages will be searched for using CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH>, or alternatively Ice_HOME may be set to the location of a specific NuGet package to restrict the search.

ICE_HOME

Environment variable (uppercased) may also be set to the root of the Ice installation; The Ice_HOME CMake variable takes precedence.

Ice_DEBUG

Set this variable to boolean true to enable debug output from this module.

Note:

In most cases, none of the above variables need to be set unless multiple Ice versions are installed and a specific one is required. On Windows, the most recent version is typically found using the registry. On Unix-like systems, programs, headers, and libraries are usually found in standard locations, although Ice_SLICE_DIRS might not be detected automatically (commonly known locations are searched). All other variables default based on the value of Ice_HOME, if set. It's also possible to set Ice_HOME while selectively overriding specific locations for individual components; This might be required, for example, in newer versions of Visual Studio if the heuristics are not sufficient to identify the correct programs and libraries for the specific Visual Studio version.

### Examples
Finding the Ice core library and linking it to a project target:

```
find_package(Ice COMPONENTS Ice)
target_link_libraries(project_target PRIVATE Ice::Ice)
```

Finding Ice core library and IceSSL library, and linking them to a project target:

```
find_package(Ice COMPONENTS Ice IceSSL)
target_link_libraries(project_target PRIVATE Ice::Ice Ice::IceSSL)
```

Finding Ice core library as required component and Ice Freeze library as optional:

```
find_package(Ice COMPONENTS Ice OPTIONAL_COMPONENTS Freeze)
```

### FindIconv
Added in version 3.11.

Finds the iconv() POSIX.1 functions on the system:

```
find_package(Iconv [<version>] [...])
```

Iconv functions might be provided in the standard C library or externally in the form of an additional library.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Iconv::Iconv

Target encapsulating the iconv usage requirements, available only if iconv is found.

### Result Variables
This module defines the following variables:

Iconv_FOUND

Boolean indicating whether the (requested version of) iconv support was found.

Iconv_VERSION

Added in version 3.21.

The version of iconv found (x.y).

Note:

Some libiconv implementations don't embed the version in their header files. In this case the variables Iconv_VERSION* will be empty.

Iconv_VERSION_MAJOR

Added in version 3.21.

The major version of iconv.

Iconv_VERSION_MINOR

Added in version 3.21.

The minor version of iconv.

Iconv_INCLUDE_DIRS

The include directories containing the iconv headers.

Iconv_LIBRARIES

The iconv libraries to be linked.

### Cache Variables
The following cache variables may also be set:

Iconv_IS_BUILT_IN

A boolean variable indicating whether iconv support is stemming from the C standard library or not. Even if the C library provides iconv(), the presence of an external libiconv implementation might lead to this being false.

Iconv_INCLUDE_DIR

The directory containing the iconv headers.

Iconv_LIBRARY

The iconv library (if not implicitly given in the C library).

Note:

On POSIX platforms, iconv might be part of the C library and the cache variables Iconv_INCLUDE_DIR and Iconv_LIBRARY might be empty.

### Examples
Finding iconv and linking it to a project target:

```
find_package(Iconv)
target_link_libraries(project_target PRIVATE Iconv::Iconv)
```

### FindIcotool
Finds icotool, command-line program for converting and creating Win32 icon and cursor files:

```
find_package(Icotool [<version>] [...])
```

### Result Variables
This module defines the following variables:

Icotool_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) icotool was found.

Icotool_VERSION

Added in version 4.2.

The version of icotool found.

### Cache Variables
The following cache variables may also be set:

ICOTOOL_EXECUTABLE

The full path to the icotool tool.

### Deprecated Variables
The following variables are provided for backward compatibility:

ICOTOOL_FOUND

Deprecated since version 4.2: Use Icotool_FOUND, which has the same value.

Boolean indicating whether (the requested version of) icotool was found.

ICOTOOL_VERSION_STRING

Deprecated since version 4.2: Use Icotool_VERSION, which has the same value.

The version of icotool found.

### Examples
Finding icotool and executing it in a process to create .ico icon from the source .png image located in the current source directory:

```
find_package(Icotool)
if(Icotool_FOUND)

  execute_process(

    COMMAND

      ${ICOTOOL_EXECUTABLE} -c -o ${CMAKE_CURRENT_BINARY_DIR}/img.ico img.png

  )
endif()
```

### FindICU
Added in version 3.7.

Finds the International Components for Unicode (ICU) libraries and programs:

```
find_package(ICU [<version>] COMPONENTS <components>... [...])
```

Added in version 3.11: Support for static libraries on Windows.

### Components
This module supports components, which can be specified with:

```
find_package(ICU COMPONENTS <components>...)
```

The following components are supported:

data

Finds the ICU Data library. On Windows, this library component is named dt, otherwise any of these component names may be used, and the appropriate platform-specific library name will be automatically selected.

i18n

Finds the ICU Internationalization library. On Windows, this library component is named in, otherwise any of these component names may be used, and the appropriate platform-specific library name will be automatically selected.

io

Finds the ICU Stream and I/O (Unicode stdio) library.

le

Finds the deprecated ICU Layout Engine library, which has been removed as of ICU version 58.

lx

Finds the ICU Layout Extensions Engine library, used for paragraph layout.

test

Finds the ICU test suits.

tu

Finds the ICU Tool Utility library.

uc

Finds the base ICU Common and Data libraries. This library is required by all other ICU libraries and is recommended to include when working with ICU components.

At least one component should be specified for this module to successfully find ICU.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

ICU::<component>

Target encapsulating the usage requirements for the specified ICU component, available only if that component is found. The <component> should be written in lowercase, as listed above. For example, use ICU::i18n for the Internationalization library.

### Result Variables
This module defines the following variables:

ICU_FOUND

Boolean indicating whether the (requested version of) main ICU programs and libraries were found.

ICU_VERSION

The version of the ICU release found.

ICU_INCLUDE_DIRS

The include directories containing the ICU headers.

ICU_LIBRARIES

Component libraries to be linked.

ICU programs are defined in the following variables:

ICU_GENCNVAL_EXECUTABLE

The path to the gencnval executable.

ICU_ICUINFO_EXECUTABLE

The path to the icuinfo executable.

ICU_GENBRK_EXECUTABLE

The path to the genbrk executable.

ICU_ICU-CONFIG_EXECUTABLE

The path to the icu-config executable.

ICU_GENRB_EXECUTABLE

The path to the genrb executable.

ICU_GENDICT_EXECUTABLE

The path to the gendict executable.

ICU_DERB_EXECUTABLE

The path to the derb executable.

ICU_PKGDATA_EXECUTABLE

The path to the pkgdata executable.

ICU_UCONV_EXECUTABLE

The path to the uconv executable.

ICU_GENCFU_EXECUTABLE

The path to the gencfu executable.

ICU_MAKECONV_EXECUTABLE

The path to the makeconv executable.

ICU_GENNORM2_EXECUTABLE

The path to the gennorm2 executable.

ICU_GENCCODE_EXECUTABLE

The path to the genccode executable.

ICU_GENSPREP_EXECUTABLE

The path to the gensprep executable.

ICU_ICUPKG_EXECUTABLE

The path to the icupkg executable.

ICU_GENCMN_EXECUTABLE

The path to the gencmn executable.

ICU component libraries are defined in the following variables:

ICU_<COMPONENT>_FOUND

Boolean indicating whether the ICU component was found; The <COMPONENT> should be written in uppercase.

ICU_<COMPONENT>_LIBRARIES

Libraries for component; The <COMPONENT> should be written in uppercase.

ICU datafiles are defined in the following variables:

ICU_MAKEFILE_INC

The path to the Makefile.inc file.

ICU_PKGDATA_INC

The path to the pkgdata.inc file.

### Cache Variables
The following cache variables may also be set:

ICU_<PROGRAM>_EXECUTABLE

The path to executable <PROGRAM>; The <PROGRAM> should be written in uppercase. These variables correspond to the ICU program result variables listed above.

ICU_INCLUDE_DIR

The directory containing the ICU headers.

ICU_<COMPONENT>_LIBRARY

The library for the ICU component. The <COMPONENT> should be written in uppercase.

### Hints
This module reads hints about search results from:

ICU_ROOT

The root of the ICU installation. The environment variable ICU_ROOT may also be used; the ICU_ROOT variable takes precedence.

Note:

In most cases, none of the above variables will need to be set, unless multiple versions of ICU are available and a specific version is required.

### Examples
Finding ICU components and linking them to a project target:

```
find_package(ICU COMPONENTS i18n io uc)
target_link_libraries(project_target PRIVATE ICU::i18n ICU::io ICU::uc)
```

### FindImageMagick
Finds ImageMagick, a software suite for displaying, converting, and manipulating raster images:

```
find_package(ImageMagick [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.9: Support for ImageMagick 7.

### Components
This module supports components and searches for a set of ImageMagick tools. Typical components include the names of ImageMagick executables, but are not limited to the following (future versions of ImageMagick may provide additional components not listed here):

- animate

- compare

- composite

- conjure

- convert

- display

- identify

- import

- mogrify

- montage

- stream

There are also components for the following ImageMagick APIs:

Magick++

Finds the ImageMagick C++ API.

MagickWand

Finds the ImageMagick MagickWand C API.

MagickCore

Finds the ImageMagick MagickCore low-level C API.

Components can be specified using the find_package() <#command:find_package> command:

```
find_package(ImageMagick [COMPONENTS <components>...])
```

If no components are specified, the module only searches for the ImageMagick executable directory.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

ImageMagick::Magick++

Added in version 3.26.

Target encapsulating the ImageMagick C++ API usage requirements, available if ImageMagick C++ is found.

ImageMagick::MagickWand

Added in version 3.26.

Target encapsulating the ImageMagick MagickWand C API usage requirements, available if MagickWand is found.

ImageMagick::MagickCore

Added in version 3.26.

Target encapsulating the ImageMagick MagickCore low-level C API usage requirements, available if MagickCore is found.

### Result Variables
This module defines the following variables:

ImageMagick_FOUND

Boolean indicating whether (the requested version of) ImageMagick and all its requested components were found.

ImageMagick_VERSION

Added in version 4.2.

The version of ImageMagick found in form of <major>.<minor>.<patch>-<addendum> (e.g., 6.9.12-98, where 98 is the addendum release number).

Note:

Version detection is available only for ImageMagick 6 and later.

ImageMagick_INCLUDE_DIRS

All include directories needed to use ImageMagick.

ImageMagick_LIBRARIES

Libraries needed to link against to use ImageMagick.

ImageMagick_COMPILE_OPTIONS

Added in version 3.26.

Compile options of all libraries.

ImageMagick_<component>_FOUND

Boolean indicating whether the ImageMagick <component> is found.

ImageMagick_<component>_EXECUTABLE

The full path to <component> executable.

ImageMagick_<component>_INCLUDE_DIRS

Include directories containing headers needed to use the ImageMagick <component>.

ImageMagick_<component>_COMPILE_OPTIONS

Added in version 3.26.

Compile options of the ImageMagick <component>.

ImageMagick_<component>_LIBRARIES

Added in version 3.31.

Libraries needed to link against to use the ImageMagick <component>.

### Cache Variables
The following cache variables may also be set:

ImageMagick_EXECUTABLE_DIR

The full path to directory containing ImageMagick executables.

### Deprecated Variables
The following variables are provided for backward compatibility:

ImageMagick_VERSION_STRING

Deprecated since version 4.2: Use ImageMagick_VERSION, which has the same value.

The version of ImageMagick found.

### Examples
Finding ImageMagick with its component Magick++ and linking it to a project target:

```
find_package(ImageMagick COMPONENTS Magick++)
target_link_libraries(example PRIVATE ImageMagick::Magick++)
```

### FindIntl
Added in version 3.2.

Finds internationalization support that includes message translation functions such as gettext():

```
find_package(Intl [<version>] [...])
```

These functions originate from the GNU libintl library, which is part of the GNU gettext utilities, but may also be provided by the standard C library.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Intl::Intl

Added in version 3.20.

Target encapsulating the Intl usage requirements, available if Intl is found.

### Result Variables
This module defines the following variables:

Intl_FOUND

Boolean indicating whether (the requested version of) Intl was found.

Intl_VERSION

Added in version 3.21.

The version of the found Intl implementation or library, in the format x.y.z.

Note:

Some Intl implementations don't embed the version in their header files. In this case the variables Intl_VERSION* will be empty.

Intl_VERSION_MAJOR

Added in version 3.21.

The major version of Intl found.

Intl_VERSION_MINOR

Added in version 3.21.

The minor version of Intl found.

Intl_VERSION_PATCH

Added in version 3.21.

The patch version of Intl found.

Intl_INCLUDE_DIRS

Include directories containing headers needed to use Intl.

Intl_LIBRARIES

The libraries needed to link against to use Intl.

### Cache Variables
The following cache variables may also be set:

Intl_IS_BUILT_IN

Added in version 3.20.

Boolean indicating whether the found Intl functionality is provided by the standard C library rather than a separate libintl library.

Intl_INCLUDE_DIR

The directory containing the libintl.h header file.

Intl_LIBRARY

The path to the Intl library (if any).

Note:

On some platforms, such as Linux with GNU libc, the gettext functions are present in the C standard library and libintl is not required. The Intl_LIBRARY and Intl_INCLUDE_DIR will be empty in this case.

### Examples
Finding the Intl support and linking the imported target for use in a project:

```
find_package(Intl)
target_link_libraries(app PRIVATE Intl::Intl)
```

### See Also
•

The FindGettext <#module:FindGettext> module to find and use the GNU gettext tools (msgmerge, msgfmt, etc.).

### FindJasper
Finds the JasPer Image Coding Toolkit for handling image data in a variety of formats, such as the JPEG-2000:

```
find_package(Jasper [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Jasper::Jasper

Added in version 3.22.

Target encapsulating the JasPer library usage requirements, available only if the library is found.

### Result Variables
This module defines the following variables:

Jasper_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) JasPer was found.

Jasper_VERSION

Added in version 4.2.

The version of JasPer found.

JASPER_INCLUDE_DIRS

Added in version 3.22.

The include directories needed to use the JasPer library.

JASPER_LIBRARIES

The libraries needed to use JasPer.

### Cache Variables
The following cache variables may also be set:

JASPER_INCLUDE_DIR

The directory containing the jasper/jasper.h and other headers needed to use the JasPer library.

JASPER_LIBRARY_RELEASE

The path to the release (optimized) variant of the JasPer library.

JASPER_LIBRARY_DEBUG

The path to the debug variant of the JasPer library.

### Deprecated Variables
The following variables are provided for backward compatibility:

JASPER_FOUND

Deprecated since version 4.2: Use Jasper_FOUND, which has the same value.

Boolean indicating whether (the requested version of) JasPer was found.

JASPER_VERSION_STRING

Deprecated since version 4.2: Superseded by the Jasper_VERSION.

The version of JasPer found.

### Examples
Finding the JasPer library and linking it to a project target:

```
find_package(Jasper)
target_link_libraries(project_target PRIVATE Jasper::Jasper)
```

### FindJava
Finds the Java installation and determines its runtime tools and development components:

```
find_package(Java [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.10: Support for Java 9+ version parsing.

### Components
This module supports optional components, which can be specified with the find_package() <#command:find_package> command:

```
find_package(Java [COMPONENTS <components>...])
```

Supported components include:

Runtime

Finds the Java Runtime Environment used to execute Java byte-compiled applications.

Development

Finds development tools (java, javac, javah, jar, and javadoc). Specifying this component also implies the Runtime component.

IdlJ

Added in version 3.4.

Finds the Interface Description Language (IDL) to Java compiler.

JarSigner

Added in version 3.4.

Finds the signer and verifier tool for Java Archive (JAR) files.

If no components are specified, the module searches for the Runtime component by default.

### Result Variables
This module defines the following variables:

Java_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Java with all specified components was found.

Java_<component>_FOUND

Boolean indicating whether the <component> was found.

Java_VERSION

Version of Java found. This is set to: <major>[.<minor>[.<patch>[.<tweak>]]].

Java_VERSION_MAJOR

The major version of Java found.

Java_VERSION_MINOR

The minor version of Java found.

Java_VERSION_PATCH

The patch version of Java found.

Java_VERSION_TWEAK

The tweak version of Java found (part after the underscore character _).

Java_VERSION_STRING

Version of Java found, e.g., 1.6.0_12. Note:

Java_VERSION and Java_VERSION_STRING are not guaranteed to be identical. For example, some Java versions may return: Java_VERSION_STRING = 1.8.0_17 and Java_VERSION = 1.8.0.17. Another example is the Java OEM, with Java_VERSION_STRING = 1.8.0-oem and Java_VERSION = 1.8.0.

### Cache Variables
The following cache variables may also be set:

Java_JAVA_EXECUTABLE

The full path to the Java runtime.

Java_JAVAC_EXECUTABLE

The full path to the Java compiler.

Java_JAVAH_EXECUTABLE

The full path to the Java header generator.

Java_JAVADOC_EXECUTABLE

The full path to the Java documentation generator.

Java_IDLJ_EXECUTABLE

Added in version 3.4.

The full path to the Java idl compiler.

Java_JAR_EXECUTABLE

The full path to the Java archiver.

Java_JARSIGNER_EXECUTABLE

Added in version 3.4.

The full path to the Java jar signer.

### Hints
This module accepts the following variables:

JAVA_HOME

The caller can set this variable to specify the installation directory of Java explicitly.

### Examples
Finding Java:

```
find_package(Java)
```

Finding Java with at least the specified minimum version:

```
find_package(Java 1.8)
```

Finding Java and making it required (if Java is not found, processing stops with an error message):

```
find_package(Java 1.8 REQUIRED)
```

Specifying the needed Java components to find:

```
find_package(Java COMPONENTS Development JarSigner)
```

### See Also

- The FindJNI <#module:FindJNI> module to find Java Native Interface (JNI).

- The UseJava <#module:UseJava> module to use Java in CMake.

### FindJNI
Finds the Java Native Interface (JNI) include directories and libraries:

```
find_package(JNI [<version>] [COMPONENTS <components>...] [...])
```

JNI enables Java code running in a Java Virtual Machine (JVM) or Dalvik Virtual Machine (DVM) on Android to call and be called by native applications and libraries written in other languages such as C and C++.

This module finds if Java is installed and determines where the include files and libraries are. It also determines what the name of the library is.

Added in version 3.24: Imported targets, components, and Android NDK support.

When using Android NDK, the corresponding package version is reported and a specific release can be requested. At Android API level 31 and above, the additional NativeHelper component can be requested. NativeHelper is also exposed as an implicit dependency of the JVM component (only if this does not cause a conflict) which provides a uniform access to JVM functions.

### Components
This module supports optional components, which can be specified with the find_package() <#command:find_package> command:

```
find_package(JNI [COMPONENTS <components>...])
```

Supported components include:

AWT

Added in version 3.24.

Finds the Java Abstract Window Toolkit (AWT).

JVM

Added in version 3.24.

Finds the Java Virtual Machine (JVM).

NativeHelper

Added in version 3.24.

Finds the NativeHelper library on Android (libnativehelper.so), which exposes JVM functions such as JNI_CreateJavaVM().

If no components are specified, the module defaults are:

- When targeting Android with API level 31 and above: module looks for the NativeHelper component. For other Android API levels, components are by default not set.

- When targeting other systems: module looks for AWT and JVM components.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

JNI::JNI

Added in version 3.24.

Main target encapsulating all JNI usage requirements, available if jni.h is found.

JNI::AWT

Added in version 3.24.

Target encapsulating the Java AWT Native Interface (JAWT) library usage requirements, available if the AWT component is found.

JNI::JVM

Added in version 3.24.

Target encapsulating the Java Virtual Machine (JVM) library usage requirements, available if component JVM is found.

JNI::NativeHelper

Added in version 3.24.

Target encapsulating the NativeHelper library usage requirements, available when targeting Android API level 31 and above, and the library is found.

### Result Variables
This module defines the following variables:

JNI_FOUND

Boolean indicating whether (the requested version of) JNI was found.

JNI_<component>_FOUND

Added in version 3.24.

Boolean indicating whether the <component> was found.

JNI_VERSION

Full Android NDK package version (including suffixes such as -beta3 and -rc1) or undefined otherwise.

JNI_VERSION_MAJOR

Added in version 3.24.

Android NDK major version or undefined otherwise.

JNI_VERSION_MINOR

Added in version 3.24.

Android NDK minor version or undefined otherwise.

JNI_VERSION_PATCH

Added in version 3.24.

Android NDK patch version or undefined otherwise.

JNI_INCLUDE_DIRS

The include directories needed to use the JNI.

JNI_LIBRARIES

The libraries (JAWT and JVM) needed to link against to use JNI.

### Cache Variables
The following cache variables are also available to set or use:

JAVA_INCLUDE_PATH

The directory containing the jni.h header.

JAVA_INCLUDE_PATH2

The directory containing machine-dependent headers jni_md.h and jniport.h. This variable is defined only if jni.h depends on one of these headers. In contrast, Android NDK jni.h can be typically used standalone.

JAVA_AWT_INCLUDE_PATH

The directory containing the jawt.h header.

JAVA_AWT_LIBRARY

The path to the Java AWT Native Interface (JAWT) library.

JAVA_JVM_LIBRARY

The path to the Java Virtual Machine (JVM) library.

### Hints
This module accepts the following variables:

JAVA_HOME

The caller can set this variable to specify the installation directory of Java explicitly.

### Examples
Finding JNI and linking it to a project target:

```
find_package(JNI)
target_link_libraries(project_target PRIVATE JNI::JNI)
```

Finding JNI with AWT component specified and linking them to a project target:

```
find_package(JNI COMPONENTS AWT)
target_link_libraries(project_target PRIVATE JNI::JNI JNI::AWT)
```

A more common way to use Java and JNI in CMake is to use a dedicated UseJava <#module:UseJava> module:

```
find_package(Java)
find_package(JNI)
include(UseJava)
```

### See Also

- The FindJava <#module:FindJava> module to find Java runtime tools and development components.

- The UseJava <#module:UseJava> module to use Java in CMake.

### FindJPEG
Finds the Joint Photographic Experts Group (JPEG) library (libjpeg):

```
find_package(JPEG [<version>] [...])
```

Changed in version 3.12: Debug and Release JPEG library variants are now found separately.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

JPEG::JPEG

Added in version 3.12.

Target encapsulating the JPEG library usage requirements. It is available only when JPEG is found.

### Result Variables
This module defines the following variables:

JPEG_FOUND

Boolean indicating whether the (requested version of) JPEG library was found.

JPEG_VERSION

Added in version 3.12.

The version of JPEG library found.

JPEG_INCLUDE_DIRS

Include directories containing headers needed to use JPEG.

JPEG_LIBRARIES

Libraries needed to link to JPEG.

### Cache Variables
The following cache variables may also be set:

JPEG_INCLUDE_DIR

Directory containing the <jpeglib.h> and related header files.

JPEG_LIBRARY_RELEASE

Added in version 3.12.

Path to the release (optimized) variant of the JPEG library.

JPEG_LIBRARY_DEBUG

Added in version 3.12.

Path to the debug variant of the JPEG library.

### Deprecated Variables
The following variables are provided for backward compatibility:

JPEG_LIBRARY

Deprecated since version 3.12: This variable has been superseded by the JPEG_LIBRARY_RELEASE and JPEG_LIBRARY_DEBUG variables.

Path to the JPEG library.

### Examples
Finding JPEG library and linking it to a project target:

```
find_package(JPEG)
target_link_libraries(project_target PRIVATE JPEG::JPEG)
```

### FindKDE3
Note:

This module is specifically intended for KDE version 3, which is obsolete and no longer maintained. For modern application development using KDE technologies with CMake, use a newer version of KDE, and refer to the KDE documentation <https://develop.kde.org/docs/getting-started/building/cmake-build/>.

Finds KDE 3 include directories, libraries, and KDE-specific preprocessor tools:

```
find_package(KDE3 [...])
```

This module provides usage requirements for building KDE 3 software and defines several helper commands to simplify working with KDE 3 in CMake.

### Result Variables
This module defines the following variables:

KDE3_FOUND

Boolean indicating whether KDE 3 was found.

KDE3_DEFINITIONS

Compiler definitions required for compiling KDE 3 software.

KDE3_INCLUDE_DIRS

The KDE and the Qt include directories, for use with the target_include_directories() <#command:target_include_directories> command.

KDE3_LIB_DIR

The directory containing the installed KDE 3 libraries, for use with the target_link_directories() <#command:target_link_directories> command.

QT_AND_KDECORE_LIBS

A list containing both the Qt and the kdecore library, typically used together when linking KDE 3.

### Cache Variables
The following cache variables may also be set:

KDE3_INCLUDE_DIR

The directory containing KDE 3 header files.

KDE3_DCOPIDL_EXECUTABLE

The path to the dcopidl executable.

KDE3_DCOPIDL2CPP_EXECUTABLE

The path to the dcopidl2cpp executable.

KDE3_KCFGC_EXECUTABLE

The path to the kconfig_compiler executable.

### Hints
This module accepts the following variables:

KDE3_BUILD_TESTS

Provided as a user adjustable option. Set this variable to boolean true to build KDE 3 testcases.

### Commands
This module provides the following commands to work with KDE 3 in CMake:

kde3_automoc

Enables automatic processing with moc for the given source files:

```
kde3_automoc(<sources>...)
```

Call this command to enable automatic moc file handling. For example, if a source file (e.g., foo.cpp) contains include "foo.moc", a moc file for the corresponding header (foo.h) will be generated automatically. To skip processing for a specific source file, set the SKIP_AUTOMOC <#prop_sf:SKIP_AUTOMOC> source file property.

kde3_add_moc_files

Processes header files with moc:

```
kde3_add_moc_files(<variable> <headers>...)
```

If not using kde3_automoc(), this command can be used to generate moc files for one or more <headers> files. The generated files are named <filename>.moc.cpp and the resulting list of these generated source files is stored in the variable named <variable> for use in project targets.

kde3_add_dcop_skels

Generates KIDL and DCOP skeletons:

```
kde3_add_dcop_skels(<variable> <dcop-headers>...)
```

This command generates .kidl and DCOP skeleton source files from the given DCOP header files. The resulting list of generated source files is stored in the variable named <variable> for use in project targets.

kde3_add_dcop_stubs

Generates DCOP stubs:

```
kde3_add_dcop_stubs(<variable> <headers>...)
```

Use this command to generate DCOP stubs from one or more given header files. The resulting list of generated source files is stored in the variable named <variable> for use in project targets.

kde3_add_ui_files

Adds Qt designer UI files:

```
kde3_add_ui_files(<variable> <ui-files>...)
```

This command creates the implementation files from the given Qt designer .ui files. The resulting list of generated files is stored in the variable named <variable> for use in project targets.

kde3_add_kcfg_files

Adds KDE kconfig compiler files:

```
kde3_add_kcfg_files(<variable> <kcfgc-files>...)
```

Use this command to add KDE kconfig compiler files (.kcfgc) to the application/library. The resulting list of generated source files is stored in the variable named <variable> for use in project targets.

kde3_install_libtool_file

Creates and installs a libtool file:

```
kde3_install_libtool_file(<target>)
```

This command creates and installs a basic libtool file for the given target <target>.

kde3_add_executable

Adds KDE executable:

```
kde3_add_executable(<name> <sources>...)
```

This command is functionally identical to the built-in add_executable() <#command:add_executable> command. It was originally intended to support additional features in future versions of this module.

kde3_add_kpart

Creates a KDE plugin:

```
kde3_add_kpart(<name> [WITH_PREFIX] <sources>...)
```

This command creates a KDE plugin (KPart, kioslave, etc.) from one or more source files <sources>. It also creates and installs an appropriate libtool .la file.

If the WITH_PREFIX option is given, the resulting plugin name will be prefixed with lib. Otherwise, no prefix is added.

kde3_add_kdeinit_executable

Creates a KDE application as a module loadable via kdeinit:

```
kde3_add_kdeinit_executable(<name> <sources>...)
```

This command creates a library named kdeinit_<name> from one or more source files <sources>. It also builds a small executable linked against this library.

### Examples
Finding KDE 3:

```
find_package(KDE3)
```

### FindKDE4
Note:

This module is specifically intended for KDE version 4, which is obsolete and no longer maintained. For modern application development using KDE technologies with CMake, use a newer version of KDE, and refer to the KDE documentation <https://develop.kde.org/docs/getting-started/building/cmake-build/>.

Finds the KDE 4 installation:

```
find_package(KDE4 [...])
```

This module is a wrapper around the following upstream KDE 4 modules:

FindKDE4Internal.cmake

Upstream internal module, which finds the KDE 4 include directories, libraries, and KDE-specific preprocessor tools. It provides usage requirements for building KDE 4 software and defines several helper commands to simplify working with KDE 4 in CMake.

KDE4Macros.cmake

Upstream utility module that defines all additional KDE4-specific commands to use KDE 4 in CMake. For example: kde4_automoc(), kde4_add_executable(), kde4_add_library(), kde4_add_ui_files(), kde4_add_ui3_files(), kde4_add_kcfg_files(), kde4_add_kdeinit_executable(), etc.

Upstream KDE 4 modules are installed by the KDE 4 distribution package in $KDEDIRS/share/apps/cmake/modules/. This path is automatically appended to the CMAKE_MODULE_PATH <#variable:CMAKE_MODULE_PATH> variable when calling find_package(KDE4), so any additional KDE 4 modules can be included in the project with include() <#command:include>. For example:

KDE4Defaults.cmake

Upstream internal module that sets some CMake options which are useful, but not required for building KDE 4 software. If these settings should be used, include this module after finding KDE 4:

```
find_package(KDE4)
include(KDE4Defaults)
```

For usage details, refer to the upstream KDE 4 documentation. For example, at the top of the FindKDE4Internal module a complete documentation is available for all variables and commands these modules provide.

### Result Variables
This module defines the following variables:

KDE4_FOUND

Boolean indicating whether KDE 4 was found. This variable is set by the upstream FindKDE4Internal module.

### Hints
This module accepts the following variables before calling the find_package(KDE4):

ENV{KDEDIRS}

Environment variable containing the path to the KDE 4 installation.

KDE 4 is searched in the following directories in the given order:

- CMAKE_INSTALL_PREFIX <#variable:CMAKE_INSTALL_PREFIX> variable

- KDEDIRS environment variable

- /opt/kde4 path

### Example: Basic Usage
Finding KDE 4 as required and using it in CMake:

```
find_package(KDE4 REQUIRED)
set(sources main.cpp mywidget.cpp mypart.cpp)
# The kde4_*() commands are provided by the KDE4Macros module, which is
# included automatically by FindKDE4, if KDE4 is found:
kde4_automoc(${sources})
kde4_add_executable(example ${sources})
target_include_directories(example PRIVATE ${KDE4_INCLUDES})
target_link_libraries(example PRIVATE ${KDE4_KDEUI_LIBS} ${KDE4_KPARTS_LIBS})
install(TARGETS example DESTINATION ${CMAKE_INSTALL_BINDIR})
install(FILES kfoo.desktop DESTINATION ${XDG_APPS_DIR})
```

### Example: Full Featured Example
In the following example this module is used to find KDE 4 installation.

```
project(kfoo)
find_package(KDE4 REQUIRED)
# Append path from where to include local project modules if any:
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
include_directories(${KDE4_INCLUDE_DIRS})
add_definitions(${KDE4_DEFINITIONS})
set(sources main.cpp myappl.cpp view.cpp)
# If Qt designer UI files version 3 or 4 are available add them to the
# sources variable:
kde4_add_ui_files(sources maindialog.ui logindialog.ui)
kde4_add_ui3_files(sources printerdlg.ui previewdlg.ui)
# If there are files for the kconfig_compiler add them this way:
kde4_add_kcfg_files(sources settings.kcfg)
# When everything is listed, probably automoc is wanted:
kde4_automoc(${sources})
# Finally, specify what to build:
kde4_add_executable(kfoo ${sources})
```

The kde4_add_executable() command is a slightly extended version of the CMake command add_executable() <#command:add_executable>. Additionally, it does some more RPATH handling and supports the KDE4_ENABLE_FINAL variable. The first argument is the name of the executable followed by a list of source files. If a library needs to be created instead of an executable, the kde4_add_library() can be used. It is an extended version of the add_library() <#command:add_library> command. It adds support for the KDE4_ENABLE_FINAL variable and under Windows it adds the -DMAKE_KFOO_LIB to the compile flags.

```
find_package(KDE4 REQUIRED)
# ...
kde4_add_library(kfoo ${sources})
# Optionally, set the library version number if needed:
set_target_properties(kfoo PROPERTIES VERSION 5.0.0 SOVERSION 5)
```

KDE is very modular, so if a KPart, a control center module, or an ioslave needs to be created, here's how to do it:

```
find_package(KDE4 REQUIRED)
# ...
kde4_add_plugin(kfoo ${sources})
```

Now, the application/library/plugin probably needs to link to some libraries. For this use the standard target_link_libraries() <#command:target_link_libraries> command. For every KDE library there are variables available in the form of KDE4_FOO_LIBS. Use them to get also all depending libraries:

```
target_link_libraries(kfoo ${KDE4_KDEUI_LIBS} ${KDE4_KIO_LIBS})
```

### Example: The kdeinit Executable
In the following example, the so called kdeinit executable is created. The kde4_add_kdeinit_executable() command creates both an executable with the given name and a library with the given name prefixed with kdeinit_. The target_link_libraries() <#command:target_link_libraries> command adds all required libraries to the kdeinit_kbar library, and then links the kbar against the kdeinit_kbar:

```
find_package(KDE4 REQUIRED)
# ...
kde4_add_kdeinit_executable(kbar ${kbarSources})
target_link_libraries(kdeinit_kbar ${KDE4_KIO_LIBS})
target_link_libraries(kbar kdeinit_kbar)
install(TARGETS kbar DESTINATION ${CMAKE_INSTALL_BINDIR})
install(TARGETS kdeinit_kbar DESTINATION ${CMAKE_INSTALL_LIBDIR})
```

### Example: Removing Compile Definitions
Sometimes, a default compile definition passed to the compiler needs to be removed. The remove_definitions() <#command:remove_definitions> command can be used. For example, by default, the KDE4 build system sets the -DQT_NO_STL flag. If the project code uses some of the Qt STL compatibility layer, this flag should be removed:

```
find_package(KDE4 REQUIRED)
add_definitions(${KDE4_DEFINITIONS})
# ...
remove_definitions(-DQT_NO_STL)
```

### FindLAPACK
Finds the installed Linear Algebra PACKage (LAPACK) Fortran library that implements the LAPACK linear-algebra interface <https://netlib.org/lapack/>:

```
find_package(LAPACK [...])
```

At least one of the C, CXX, or Fortran languages must be enabled.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

LAPACK::LAPACK

Added in version 3.18.

Target encapsulating the LAPACK usage requirements, available only if LAPACK is found.

### Result Variables
This module defines the following variables:

LAPACK_FOUND

Boolean indicating whether the library implementing the LAPACK interface was found.

LAPACK_LINKER_FLAGS

Uncached list of required linker flags (excluding -l and -L).

LAPACK_LIBRARIES

Uncached list of libraries (using full path name) to link against to use LAPACK.

LAPACK95_LIBRARIES

Uncached list of libraries (using full path name) to link against to use LAPACK95.

LAPACK95_FOUND

Boolean indicating whether the library implementing the LAPACK95 interface was found.

### Input Variables
The following variables may be set to influence this module's behavior:

BLA_STATIC

If ON, the static linkage will be used.

BLA_VENDOR

Set to one of the BLAS/LAPACK Vendors <#blas-lapack-vendors> to search for BLAS only from the specified vendor. If not set, all vendors are considered.

BLA_F95

If ON, the module tries to find the BLAS95/LAPACK95 interfaces.

BLA_PREFER_PKGCONFIG

Added in version 3.20.

If set, pkg-config will be used to search for a LAPACK library first and if one is found that is preferred.

BLA_PKGCONFIG_LAPACK

Added in version 3.25.

If set, the pkg-config method will look for this module name instead of just lapack.

BLA_SIZEOF_INTEGER

Added in version 3.22.

Specify the BLAS/LAPACK library integer size:

4

Search for a BLAS/LAPACK with 32-bit integer interfaces.

8

Search for a BLAS/LAPACK with 64-bit integer interfaces.

ANY

Search for any BLAS/LAPACK. Most likely, a BLAS/LAPACK with 32-bit integer interfaces will be found.

BLA_THREAD

Added in version 4.1.

Specify the BLAS/LAPACK threading model:

SEQ

Sequential model

OMP

OpenMP model

ANY

Search for any BLAS/LAPACK, if both are available most likely OMP will be found.

This is currently only supported by NVIDIA NVPL.

### Intel MKL
To use the Intel MKL implementation of LAPACK, a project must enable at least one of the C or CXX languages. Set BLA_VENDOR to an Intel MKL variant either on the command-line as -DBLA_VENDOR=Intel10_64lp or in project code:

```
set(BLA_VENDOR Intel10_64lp)
find_package(LAPACK)
```

In order to build a project using Intel MKL, and end user must first establish an Intel MKL environment. See the FindBLAS <#module:FindBLAS> module section on Intel MKL <#intel-mkl> for details.

### Examples
Finding LAPACK and linking it to a project target:

```
find_package(LAPACK)
target_link_libraries(project_target PRIVATE LAPACK::LAPACK)
```

### FindLATEX
Finds LaTeX compiler and Latex-related software like BibTeX:

```
find_package(LATEX [...])
```

LaTeX is a typesetting system for the production of technical and scientific documentation.

### Components
Added in version 3.2.

Components can be optionally specified using a standard CMake syntax:

```
find_package(LATEX [COMPONENTS <component>...])
```

Supported components are:

PDFLATEX

Finds the PdfLaTeX compiler.

XELATEX

Finds the XeLaTeX compiler.

LUALATEX

Finds the LuaLaTeX compiler.

BIBTEX

Finds the BibTeX compiler.

BIBER

Finds the Biber compiler.

MAKEINDEX

Finds the MakeIndex compiler.

XINDY

Finds the xindy compiler.

DVIPS

Finds the DVI-to-PostScript (DVIPS) converter.

DVIPDF

Finds the DVIPDF converter.

PS2PDF

Finds the PS2PDF converter.

PDFTOPS

Finds the PDF-to-PostScript converter.

LATEX2HTML

Finds the converter for converting LaTeX documents to HTML.

HTLATEX

Finds htlatex compiler.

### Result Variables
This module defines the following variables:

LATEX_FOUND

Boolean indicating whether the LaTex compiler and all its required components were found.

LATEX_<component>_FOUND

Boolean indicating whether the LaTeX <component> was found.

### Cache Variables
The following cache variables may also be set:

LATEX_COMPILER

The path to the LaTeX compiler.

PDFLATEX_COMPILER

The path to the PdfLaTeX compiler.

XELATEX_COMPILER

Added in version 3.2.

The path to the XeLaTeX compiler.

LUALATEX_COMPILER

Added in version 3.2.

The path to the LuaLaTeX compiler.

BIBTEX_COMPILER

The path to the BibTeX compiler.

BIBER_COMPILER

Added in version 3.2.

The path to the Biber compiler.

MAKEINDEX_COMPILER

The path to the MakeIndex compiler.

XINDY_COMPILER

Added in version 3.2.

The path to the xindy compiler.

DVIPS_CONVERTER

The path to the DVIPS converter.

DVIPDF_CONVERTER

The path to the DVIPDF converter.

PS2PDF_CONVERTER

The path to the PS2PDF converter.

PDFTOPS_CONVERTER

Added in version 3.2.

The path to the pdftops converter.

LATEX2HTML_CONVERTER

The path to the LaTeX2Html converter.

HTLATEX_COMPILER

Added in version 3.2.

The path to the htlatex compiler.

### Examples
Finding LaTeX in a project:

```
find_package(LATEX)
```

Finding LaTeX compiler and specifying which additional LaTeX components are required for LaTeX to be considered found:

```
find_package(LATEX COMPONENTS PDFLATEX)
if(LATEX_FOUND)

  execute_process(COMMAND ${LATEX_COMPILER} ...)

  execute_process(COMMAND ${PDFLATEX_COMPILER} ...)
endif()
```

Or finding LaTeX compiler and specifying multiple components:

```
find_package(LATEX COMPONENTS BIBTEX PS2PDF)
if(LATEXT_FOUND)

  # ...
endif()
```

### FindLibArchive
Finds the libarchive library and include directories:

```
find_package(LibArchive [<version>] [...])
```

Libarchive is a multi-format archive and compression library.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

LibArchive::LibArchive

Added in version 3.17.

A target encapsulating the libarchive usage requirements, available only if libarchive is found.

### Result Variables
This module defines the following variables:

LibArchive_FOUND

Boolean indicating whether (the requested version of) libarchive was found.

LibArchive_VERSION

A 3-component version string (major.minor.patch) of libarchive found. Added in version 3.6: Support for a new libarchive version string format. Starting from libarchive version 3.2, a different preprocessor macro is used in the header to define the version. In CMake 3.5 and earlier, this variable will be set only for libarchive versions 3.1 and earlier. In CMake 3.6 and newer, this variable will be set for all libarchive versions.

LibArchive_INCLUDE_DIRS

Include search path for using libarchive.

LibArchive_LIBRARIES

Libraries to link against libarchive.

### Examples
Finding libarchive and linking it to a project target:

```
find_package(LibArchive)
target_link_libraries(project_target PRIVATE LibArchive::LibArchive)
```

### FindLibinput
Added in version 3.14.

Finds the libinput library which handles input devices in Wayland compositors and provides a generic X.Org input driver:

```
find_package(Libinput [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Libinput::Libinput

Target encapsulating the libinput library usage requirements, available only if library is found.

### Result Variables
This module defines the following variables:

Libinput_FOUND

Boolean indicating whether the (requested version of) libinput library was found.

Libinput_VERSION

The version of the libinput found.

Libinput_LIBRARIES

The libraries to link against to use the libinput library.

Libinput_INCLUDE_DIRS

The include directories containing headers needed to use the libinput library.

Libinput_COMPILE_OPTIONS

Compile options needed to use the libinput library. These can be passed to the target_compile_options() <#command:target_compile_options> command, when not using the Libinput::Libinput imported target.

### Examples
Finding the libinput library and linking it to a project target:

```
find_package(Libinput)
target_link_libraries(project_target PRIVATE Libinput::Libinput)
```

### FindLibLZMA
Finds the liblzma, a data compression library that implements the LZMA (Lempel-Ziv-Markov chain algorithm):

```
find_package(LibLZMA [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

LibLZMA::LibLZMA

Added in version 3.14.

Target encapsulating the liblzma library usage requirements, available only if liblzma is found.

### Result Variables
This module defines the following variables:

LibLZMA_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) liblzma was found.

LibLZMA_VERSION

Added in version 4.2.

The version of liblzma found (available as a string, for example, 5.0.3).

LIBLZMA_INCLUDE_DIRS

Include directories containing headers needed to use liblzma.

LIBLZMA_LIBRARIES

Libraries needed to link against to use liblzma.

### Cache Variables
The following cache variables may also be set:

LIBLZMA_HAS_AUTO_DECODER

Boolean sanity check result indicating whether the lzma_auto_decoder() function (automatic decoder functionality) is found in liblzma (required).

LIBLZMA_HAS_EASY_ENCODER

Boolean sanity check result indicating whether the lzma_easy_encoder() function (basic encoder API) is found in liblzma (required).

LIBLZMA_HAS_LZMA_PRESET

Boolean sanity check result indicating whether the lzma_lzma_preset() function (preset compression configuration) is found in liblzma (required).

### Deprecated Variables
The following variables are provided for backward compatibility:

LIBLZMA_FOUND

Deprecated since version 4.2: Use LibLZMA_FOUND, which has the same value.

Boolean indicating whether (the requested version of) liblzma was found.

LIBLZMA_VERSION

Added in version 3.26.

Deprecated since version 4.2: Superseded by the LibLZMA_VERSION.

The version of liblzma found.

LIBLZMA_VERSION_STRING

Deprecated since version 3.26: Superseded by the LIBLZMA_VERSION (and LibLZMA_VERSION).

The version of liblzma found.

LIBLZMA_VERSION_MAJOR

Deprecated since version 3.26.

The major version of liblzma found.

LIBLZMA_VERSION_MINOR

Deprecated since version 3.26.

The minor version of liblzma found.

LIBLZMA_VERSION_PATCH

Deprecated since version 3.26.

The patch version of liblzma found.

### Examples
Finding the liblzma library and linking it to a project target:

```
find_package(LibLZMA)
target_link_libraries(project_target PRIVATE LibLZMA::LibLZMA)
```

### FindLibXml2
Finds the XML processing library (libxml2):

```
find_package(LibXml2 [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

LibXml2::LibXml2

Added in version 3.12.

Target encapsulating the libxml2 library usage requirements, available only if library is found.

LibXml2::xmllint

Added in version 3.17.

Target encapsulating the xmllint command-line executable, available only if xmllint executable is found.

### Result Variables
This module defines the following variables:

LibXml2_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) libxml2 library was found.

LibXml2_VERSION

Added in version 4.2.

The version of the libxml2 found.

LIBXML2_INCLUDE_DIRS

Include directories needed to use the libxml2 library.

LIBXML2_LIBRARIES

Libraries needed to link against to use the libxml2 library.

LIBXML2_DEFINITIONS

The compiler switches required for using libxml2.

### Other Variables
LibXml2_USE_STATIC_LIBS

Added in version 4.3.

Set to TRUE to use static libraries. Default is FALSE.

### Cache Variables
The following cache variables may also be set:

LIBXML2_INCLUDE_DIR

The include directory containing libxml2 headers.

LIBXML2_LIBRARY

The path to the libxml2 library.

LIBXML2_XMLLINT_EXECUTABLE

The path to the XML checking tool xmllint coming with libxml2.

### Deprecated Variables
The following variables are provided for backward compatibility:

LIBXML2_FOUND

Deprecated since version 4.2: Use LibXml2_FOUND, which has the same value.

Boolean indicating whether the (requested version of) libxml2 library was found.

LIBXML2_VERSION_STRING

Deprecated since version 4.2: Superseded by the LibXml2_VERSION.

The version of the libxml2 found.

### Examples
Finding the libxml2 library and linking it to a project target:

```
find_package(LibXml2)
target_link_libraries(project_target PRIVATE LibXml2::LibXml2)
```

### FindLibXslt
Finds the XSL Transformations, Extensible Stylesheet Language Transformations (XSLT) library (libxslt):

```
find_package(LibXslt [<version>] [...])
```

### Imported Targets
Added in version 3.18.

This module provides the following Imported Targets <#imported-targets>:

LibXslt::LibXslt

Target encapsulating the usage requirements of the libxslt library. This target is available only if libxslt is found.

LibXslt::LibExslt

Target encapsulating the usage requirements for the libexslt library. Part of the libxslt package, libexslt provides optional extensions to XSLT on top of libxslt. This target is available only if the main libxslt library is found.

LibXslt::xsltproc

Target encapsulating the command-line XSLT processor (xsltproc). This tool, part of the libxslt package, applies XSLT stylesheets to XML documents as a command-line alternative to the libxslt library. This target is available only if the xsltproc executable is found.

### Result Variables
This module defines the following variables:

LibXslt_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) libxslt was found.

LibXslt_VERSION

Added in version 4.2.

The version of libxslt found.

LIBXSLT_LIBRARIES

Libraries needed to link to libxslt.

LIBXSLT_DEFINITIONS

Compiler switches required for using libxslt.

LIBXSLT_EXSLT_LIBRARIES

Libraries needed when linking against the exslt library. These are available and needed only when using exslt library.

### Cache Variables
The following cache variables may also be set:

LIBXSLT_INCLUDE_DIR

Directory containing libxslt/xslt.h and other libxslt header files.

LIBXSLT_EXSLT_INCLUDE_DIR

Added in version 3.18.

Directory containing libexslt/exslt.h and other exslt-related headers. These are needed only when using exslt (extensions to XSLT).

LIBXSLT_XSLTPROC_EXECUTABLE

Full path to the XSLT processor executable xsltproc if found. This path is optional.

### Deprecated Variables
The following variables are provided for backward compatibility:

LIBXSLT_FOUND

Deprecated since version 4.2: Use LibXslt_FOUND, which has the same value.

Boolean indicating whether (the requested version of) libxslt was found.

LIBXSLT_VERSION_STRING

Deprecated since version 4.2: Superseded by the LibXslt_VERSION.

The version of libxslt found.

### Examples
Finding libxslt library and linking it to a project target:

```
find_package(LibXslt)
target_link_libraries(foo PRIVATE LibXslt::LibXslt)
```

When project also needs the extensions to XSLT (exslt) library, both targets should be linked:

```
find_package(LibXslt)
target_link_libraries(foo PRIVATE LibXslt::LibXslt LibXslt::LibExslt)
```

Example, how to use XSLT processor in a custom command build rule:

```
find_package(LibXslt)
if(TARGET LibXslt::xsltproc)

  # Executed when some build rule depends on example.html.

  add_custom_command(

    OUTPUT example.html

    COMMAND LibXslt::xsltproc -o example.html transform.xslt example.xml

  )
endif()
```

### FindLTTngUST
Added in version 3.6.

Finds the LTTng <https://lttng.org/> (Linux Trace Toolkit: next generation) user space tracing library (LTTng-UST):

```
find_package(LTTngUST [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

LTTng::UST

Target providing the LTTng-UST library usage requirements. This target is available only when LTTng-UST is found.

### Result Variables
This module defines the following variables:

LTTngUST_FOUND

Boolean indicating whether the (requested version of) LTTng-UST library was found.

LTTngUST_VERSION

Added in version 4.2.

The LTTng-UST version.

LTTNGUST_HAS_TRACEF

TRUE if the tracef() API is available in the system's LTTng-UST.

LTTNGUST_HAS_TRACELOG

TRUE if the tracelog() API is available in the system's LTTng-UST.

### Cache Variables
The following cache variables may also be set:

LTTNGUST_INCLUDE_DIRS

The LTTng-UST include directories.

LTTNGUST_LIBRARIES

The libraries needed to use LTTng-UST.

### Deprecated Variables
The following variables are provided for backward compatibility:

LTTNGUST_FOUND

Deprecated since version 4.2: Use LTTngUST_FOUND, which has the same value.

Boolean indicating whether the (requested version of) LTTng-UST library was found.

LTTNGUST_VERSION_STRING

Deprecated since version 4.2: Superseded by the LTTngUST_VERSION.

The LTTng-UST version.

### Examples
Finding the LTTng-UST library and linking it to a project target:

```
find_package(LTTugNST)
target_link_libraries(project_target PRIVATE LTTng::UST)
```

### FindLua
Finds the Lua library:

```
find_package(Lua [<version>] [...])
```

Lua is a embeddable scripting language.

Added in version 3.18: Support for Lua 5.4.

Added in version 4.3: Support for Lua 5.5.

When working with Lua, its library headers are intended to be included in project source code as:

```
#include <lua.h>
```

and not:

```
#include <lua/lua.h>
```

This is because, the location of Lua headers may differ across platforms and may exist in locations other than lua/.

### Result Variables
This module defines the following variables:

Lua_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Lua was found.

Lua_VERSION

Added in version 4.2.

The version of Lua found.

Lua_VERSION_MAJOR

Added in version 4.2.

The major version of Lua found.

Lua_VERSION_MINOR

Added in version 4.2.

The minor version of Lua found.

Lua_VERSION_PATCH

Added in version 4.2.

The patch version of Lua found.

LUA_LIBRARIES

Libraries needed to link against to use Lua. This list includes both lua and lualib libraries.

### Cache Variables
The following cache variables may also be set:

LUA_INCLUDE_DIR

The directory containing the Lua header files, such as lua.h, lualib.h, and lauxlib.h, needed to use Lua.

### Deprecated Variables
The following variables are provided for backward compatibility:

LUA_FOUND

Deprecated since version 4.2: Use Lua_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Lua was found.

LUA_VERSION_STRING

Deprecated since version 4.2: Superseded by the Lua_VERSION.

The version of Lua found.

LUA_VERSION_MAJOR

Deprecated since version 4.2: Superseded by the Lua_VERSION_MAJOR.

The major version of Lua found.

LUA_VERSION_MINOR

Deprecated since version 4.2: Superseded by the Lua_VERSION_MINOR.

The minor version of Lua found.

LUA_VERSION_PATCH

Deprecated since version 4.2: Superseded by the Lua_VERSION_PATCH.

The patch version of Lua found.

### Examples
Finding the Lua library and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Lua)
if(Lua_FOUND AND NOT TARGET Lua::Lua)

  add_library(Lua::Lua INTERFACE IMPORTED)

  set_target_properties(

    Lua::Lua

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${LUA_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${LUA_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE Lua::Lua)
```

### FindLua50
Note:

This module is intended specifically for Lua version branch 5.0, which is obsolete and not maintained anymore. In new code use the latest supported Lua version and the version-agnostic module FindLua <#module:FindLua> instead.

Finds the Lua library:

```
find_package(Lua50 [...])
```

Lua is a embeddable scripting language.

When working with Lua, its library headers are intended to be included in project source code as:

```
#include <lua.h>
```

and not:

```
#include <lua/lua.h>
```

This is because, the location of Lua headers may differ across platforms and may exist in locations other than lua/.

### Result Variables
This module defines the following variables:

Lua50_FOUND

Added in version 3.3.

Boolean indicating whether Lua was found.

### Cache Variables
The following cache variables may also be set:

LUA_INCLUDE_DIR

The directory containing the Lua header files, such as lua.h, lualib.h, and lauxlib.h, needed to use Lua.

LUA_LIBRARIES

Libraries needed to link against to use Lua. This list includes both lua and lualib libraries.

### Deprecated Variables
The following variables are provided for backward compatibility:

LUA50_FOUND

Deprecated since version 4.2: Use Lua50_FOUND, which has the same value.

Boolean indicating whether Lua was found.

### Examples
Finding the Lua 5.0 library and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Lua50)
if(Lua50_FOUND AND NOT TARGET Lua50::Lua50)

  add_library(Lua50::Lua50 INTERFACE IMPORTED)

  set_target_properties(

    Lua50::Lua50

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${LUA_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${LUA_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE Lua50::Lua50)
```

### See Also
•

The FindLua <#module:FindLua> module to find Lua in version-agnostic way.

### FindLua51
Note:

This module is intended specifically for Lua version branch 5.1, which is obsolete and not maintained anymore. In new code use the latest supported Lua version and the version-agnostic module FindLua <#module:FindLua> instead.

Finds the Lua library:

```
find_package(Lua51 [<version>] [...])
```

Lua is a embeddable scripting language.

When working with Lua, its library headers are intended to be included in project source code as:

```
#include <lua.h>
```

and not:

```
#include <lua/lua.h>
```

This is because, the location of Lua headers may differ across platforms and may exist in locations other than lua/.

### Result Variables
This module defines the following variables:

Lua51_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Lua was found.

Lua51_VERSION

Added in version 4.2.

The version of Lua 5.1 found.

### Cache Variables
The following cache variables may also be set:

LUA_INCLUDE_DIR

The directory containing the Lua header files, such as lua.h, lualib.h, and lauxlib.h, needed to use Lua.

LUA_LIBRARIES

Libraries needed to link against to use Lua.

### Deprecated Variables
The following variables are provided for backward compatibility:

LUA51_FOUND

Deprecated since version 4.2: Use Lua51_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Lua was found.

LUA_VERSION_STRING

Deprecated since version 4.2: Use Lua51_VERSION, which has the same value.

The version of Lua 5.1 found.

### Examples
Finding the Lua 5.1 library and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Lua51)
if(Lua51_FOUND AND NOT TARGET Lua51::Lua51)

  add_library(Lua51::Lua51 INTERFACE IMPORTED)

  set_target_properties(

    Lua51::Lua51

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${LUA_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${LUA_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE Lua51::Lua51)
```

### See Also
•

The FindLua <#module:FindLua> module to find Lua in version-agnostic way.

### FindMatlab
Finds MATLAB or MATLAB Compiler Runtime (MCR) and provides its tools, libraries and compilers to CMake:

```
find_package(Matlab [<version>] [COMPONENTS <components>...] [REGISTRY_VIEW <view>] [...])
```

The primary purpose of this module is to find the libraries associated with MATLAB or the MCR in order to be able to build MATLAB extensions (MEX files). It can also be used:

- to run specific commands in MATLAB in case MATLAB is available

- for declaring MATLAB unit tests

- to retrieve various information from MATLAB (MEX extensions, versions and release queries, ...)

Added in version 3.12: MATLAB Compiler Runtime (MCR) support.

Added in version 3.30: Support for specifying a version range to find_package() <#command:find_package>, support for specifying REGISTRY_VIEW argument to find_package() <#command:find_package>, matlab_extract_all_installed_versions_from_registry() and matlab_get_all_valid_matlab_roots_from_registry() commands. The default behavior remained unchanged, by using the registry view TARGET.

Note:

The version given to the find_package() <#command:find_package> argument is the MATLAB version, which should not be confused with the MATLAB release name (e.g. R2023b). The matlab_get_version_from_release_name() and matlab_get_release_name_from_version() commands provide a mapping between the release name and the version.

### Components
This module supports optional components which can be specified using the find_package() <#command:find_package> command:

```
find_package(Matlab [COMPONENTS <components>...])
```

Supported components include:

ENG_LIBRARY

Added in version 3.3.

Finds the ENG library of MATLAB.

MAT_LIBRARY

Added in version 3.7.

Finds the MAT library of MATLAB.

MAIN_PROGRAM

Added in version 3.3.

Finds the MATLAB binary program. Note that this component is not available on the MCR version, and will yield an error if the MCR is found instead of the regular MATLAB installation.

MEX_COMPILER

Added in version 3.3.

Finds the MEX compiler.

MCC_COMPILER

Added in version 3.13.

Finds the MCC compiler, included with the MATLAB Compiler add-on.

SIMULINK

Added in version 3.3.

Finds the Simulink environment.

### Implicitly Found Components
The following components are always found unconditionally, without needing to be specified explicitly:

MX_LIBRARY

Changed in version 3.14: This component has been removed and is now always found unconditionally.

Added in version 3.3.

Finds the MATLAB mx library.

ENGINE_LIBRARY

Changed in version 3.14: This component has been removed and is now always found unconditionally.

Added in version 3.13.

Finds the MATLAB engine library.

DATAARRAY_LIBRARY

Changed in version 3.14: This component has been removed and is now always found unconditionally.

Added in version 3.13.

Finds the C++ MATLAB data array library.

If no components are specified, the module looks for the MX_LIBRARY, ENGINE_LIBRARY, and DATAARRAY_LIBRARY by default.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Matlab::mex

Added in version 3.22.

Target encapsulating the mex library usage requirements, always available for MATLAB installations. Available for MCR installations if provided by MCR.

Matlab::mx

Added in version 3.22.

Target encapsulating the usage requirements of the mx library of MATLAB (arrays), always available for MATLAB installations. Available for MCR installations if provided by MCR.

Matlab::eng

Added in version 3.22.

Target encapsulating the MATLAB engine library usage requirements. Available only if the ENG_LIBRARY component is requested.

Matlab::mat

Added in version 3.22.

Target encapsulating the MATLAB matrix library usage requirements. Available only if the MAT_LIBRARY component is requested.

Matlab::MatlabEngine

Added in version 3.22.

Target encapsulating the MATLAB C++ engine library usage requirements, always available for MATLAB R2018a and newer. Available for MCR installations if provided by MCR.

Matlab::MatlabDataArray

Added in version 3.22.

Target encapsulating the MATLAB C++ data array library usage requirements, always available for MATLAB R2018a and newer. Available for MCR installations if provided by MCR.

### Result Variables
This module defines the following variables:

Matlab_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) MATLAB installation was found. All variables below are defined if MATLAB is found.

Matlab_VERSION

Added in version 3.27.

The numerical version (e.g. 23.2.0) of MATLAB found. Not to be confused with MATLAB release name (e.g. R2023b) that can be obtained with matlab_get_release_name_from_version().

When a MATLAB/MCR installation is found automatically and the Matlab_VERSION is not given, the version is queried from MATLAB directly (on Windows this may pop up a MATLAB window) or from the MCR installation.

Matlab_ROOT_DIR

Added in version 3.3.

The final root of the MATLAB installation determined by this module.

Matlab_MAIN_PROGRAM

Added in version 3.3.

The MATLAB binary program. Available only if the component MAIN_PROGRAM is given in the find_package() <#command:find_package> argument.

Matlab_INCLUDE_DIRS

Added in version 3.3.

The path of the MATLAB libraries headers.

Matlab_MEX_LIBRARY

Library for MEX, always available for MATLAB installations. Available for MCR installations if provided by MCR.

Matlab_MX_LIBRARY

The mx library of MATLAB (arrays), always available for MATLAB installations. Available for MCR installations if provided by MCR.

Matlab_ENG_LIBRARY

MATLAB engine library. Available only if the component ENG_LIBRARY is requested.

Matlab_MAT_LIBRARY

Added in version 3.7.

Matlab matrix library. Available only if the component MAT_LIBRARY is requested.

Matlab_ENGINE_LIBRARY

Added in version 3.13.

Matlab C++ engine library, always available for MATLAB R2018a and newer. Available for MCR installations if provided by MCR.

Matlab_DATAARRAY_LIBRARY

Added in version 3.13.

Matlab C++ data array library, always available for MATLAB R2018a and newer. Available for MCR installations if provided by MCR.

Matlab_LIBRARIES

The whole set of libraries of MATLAB.

Matlab_MEX_COMPILER

Added in version 3.3.

The MEX compiler of MATLAB. Currently not used. Available only if the component MEX_COMPILER is requested.

Matlab_MCC_COMPILER

Added in version 3.13.

The mcc compiler of MATLAB. Included with the MATLAB Compiler add-on. Available only if the component MCC_COMPILER is requested.

### Cache Variables
The following cache variables may also be set:

Matlab_MEX_EXTENSION

Added in version 3.3.

The extension of the MEX files for the current platform (given by MATLAB).

Matlab_ROOT_DIR

Added in version 3.3.

The location of the root of the MATLAB installation found. If this value is changed by the user, the result variables are recomputed.

### Input Variables
Users or projects may set the following variables to configure the module behavior before calling find_package(Matlab):

Matlab_ROOT <#variable:<PackageName>_ROOT>

Added in version 3.25.

Default value for the Matlab_ROOT_DIR variable, the root of the MATLAB installation.

Matlab_ROOT_DIR

Added in version 3.3.

The root folder of the MATLAB installation. If set before the call to find_package() <#command:find_package>, the module will look for the components in that path. If not set, then an automatic search of MATLAB will be performed. If set, it should point to a valid version of MATLAB.

This variable may be specified in order to give the path of the desired MATLAB version. Otherwise, the behavior is platform specific:

- Windows: The installed versions of MATLAB/MCR are retrieved from the Windows registry. The REGISTRY_VIEW argument may optionally be specified to manually control whether 32bit or 64bit versions shall be searched for.

- macOS: The installed versions of MATLAB/MCR are given by the MATLAB default installation paths under $HOME/Applications and /Applications. If no such application is found, it falls back to the one that might be accessible from the PATH.

- Unix: The desired MATLAB should be accessible from the PATH. This does not work for MCR installation and Matlab_ROOT_DIR should be specified on this platform.

MATLAB_FIND_DEBUG

Added in version 3.3.

If set to a boolean true, additional debug information is outputted to the console, such as the lookup of MATLAB and the intermediate configuration steps.

MATLAB_ADDITIONAL_VERSIONS

Added in version 3.3.

If set, it specifies additional versions of MATLAB for the automatic retrieval of the installed versions that may be handled and looked for.

The mapping of the release names and the version of MATLAB is performed by defining pairs (name, version). The variable should be a list of strings, organized by pairs of release name and versions, such as follows:

```
set(

  MATLAB_ADDITIONAL_VERSIONS

    "release_name1=corresponding_version1"

    "release_name2=corresponding_version2"

    # ...
)
find_package(Matlab)
```

Example:

```
set(

  MATLAB_ADDITIONAL_VERSIONS

    "R2013b=8.2"

    "R2013a=8.1"

    "R2012b=8.0"

    # ...
)
find_package(Matlab)
```

The order of entries in this list matters when several versions of MATLAB are installed. The priority is set according to the ordering in this list.

### Commands
This module provides the following commands:

- matlab_get_version_from_release_name()

- matlab_get_release_name_from_version()

- matlab_get_version_from_matlab_run()

- matlab_extract_all_installed_versions_from_registry()

- matlab_get_all_valid_matlab_roots_from_registry()

- matlab_add_mex()

- matlab_get_mex_suffix()

- matlab_add_unit_test()

matlab_get_version_from_release_name

Added in version 3.3.

Returns the version of MATLAB from a release name:

```
matlab_get_version_from_release_name(<release-name> <version-var>)
```

The arguments are:

<release-name>

Input release name string (e.g. R2023b).

<version-var>

The name of the variable in which to store the version of MATLAB. The output result is e.g. 23.2.0.

Note:

This command provides correct versions mappings for MATLAB but not MCR.

matlab_get_release_name_from_version

Added in version 3.3.

Returns the release name from the version of MATLAB:

```
matlab_get_release_name_from_version(<version> <release-name-var>)
```

The arguments are:

<version>

Input MATLAB version string (e.g. 23.2.0).

<release-name-var>

The name of the variable in which to store the MATLAB release name. The output result is e.g. R2023b.

Note:

This command provides correct version mappings for MATLAB but not MCR.

matlab_get_version_from_matlab_run

Added in version 3.3.

Runs the specified MATLAB program and extracts the version of MATLAB/MCR, given the full directory of the MATLAB/MCR installation path:

```
matlab_get_version_from_matlab_run(<matlab-binary> <matlab-versions-var>)
```

The arguments are:

<matlab-binary>

The path to the matlab binary executable.

<matlab-versions-var>

The name of the variable in which a list of extracted MATLAB versions are stored.

If the path provided for the MATLAB installation points to an MCR installation, the version is extracted from the installed files.

matlab_extract_all_installed_versions_from_registry

Added in version 3.3.

Parses the Windows registry and finds all installed MATLAB versions:

matlab_extract_all_installed_versions_from_registry(<versions-var> [REGISTRY_VIEW <view>])

The arguments are:

<versions-var>

The name of the variable in which to store the list of all MATLAB versions found.

REGISTRY_VIEW <view>

Added in version 3.30.

Optional registry view argument that provides a more precise interface on how to interact with the Windows Registry. The argument is passed (or omitted) to cmake_host_system_information() <#command:cmake_host_system_information> without further checks or modification. For example, <view> value can be one of 64, 32, 64_32, 32_64, HOST, TARGET, BOTH.

The old signature is:

matlab_extract_all_installed_versions_from_registry(<win64> <versions-var>)

The arguments are:

<win64>

Boolean whether to search for the 64-bit version of MATLAB. If set to boolean true, 64-bit registry view will be searched. If set to boolean false, 32-bit registry view will be searched. For finer control, use the above signature.

<versions-var>

The name of the variable in which to store the list of all MATLAB versions found.

This command is available on Windows only. The part of the registry parsed is dependent on the host processor.

The returned list contains all versions under HKLM\SOFTWARE\Mathworks\MATLAB, HKLM\SOFTWARE\Mathworks\MATLAB Runtime and HKLM\SOFTWARE\Mathworks\MATLAB Compiler Runtime or an empty list in case an error occurred (or nothing found).

Note:

Only the versions are provided. No check is made over the existence of the installation referenced in the registry.

matlab_get_all_valid_matlab_roots_from_registry

Added in version 3.3.

Returns all the possible MATLAB or MCR paths, according to a previously given list:

```
matlab_get_all_valid_matlab_roots_from_registry(

  <matlab-versions>

  <matlab-roots-var>

  [REGISTRY_VIEW <view>]
)
```

This command populates the MATLAB root with valid versions of MATLAB or MATLAB Runtime (MCR) and is mainly useful for the searching of all possible MATLAB installations. Only the existing/accessible paths are kept.

The arguments are:

<matlab-versions>

A semicolon-separated list <#cmake-language-lists> of each of the MATLAB or MCR installations. Specify it as a single string value.

<matlab-roots-var>

The name of the variable in which to store a list of locations of each of the MATLAB or MCR installations. The value of this variable is organized in triplets (type,version_number,matlab_root_path), where type indicates either MATLAB or MCR.

REGISTRY_VIEW <view>

Added in version 3.30.

Optional registry view argument that provides a more precise interface on how to interact with the Windows Registry. The argument is passed (or omitted) to cmake_host_system_information() <#command:cmake_host_system_information> without further checks or modification. For example, <view> value can be one of 64, 32, 64_32, 32_64, HOST, TARGET, BOTH.

matlab_add_mex

Added in version 3.3.

Adds a target that compiles MATLAB MEX target file:

```
matlab_add_mex(

  NAME <name>

  [EXECUTABLE | MODULE | SHARED]

  SRC <sources>...

  [OUTPUT_NAME <output-name>]

  [DOCUMENTATION <file>]

  [LINK_TO <targets>...]

  [R2017b | R2018a]

  [EXCLUDE_FROM_ALL]

  [NO_IMPLICIT_LINK_TO_MATLAB_LIBRARIES]

  [...]
)
```

This commands compiles the given sources with the current tool-chain in order to produce a MEX file. The final name of the produced output may be specified, as well as additional link libraries, and a documentation entry for the MEX file. Remaining arguments of the call are passed to the add_library() <#command:add_library> or add_executable() <#command:add_executable> command.

The arguments are:

NAME <name>

The name of the target.

SRC <sources>...

One or more source files to be compiled.

LINK_TO <targets>...

A list of additional link dependencies. The target links to libmex and libmx by default, unless the NO_IMPLICIT_LINK_TO_MATLAB_LIBRARIES option is passed.

OUTPUT_NAME <output-name>

If given, overrides the default name. The default name is the name of the target without any prefix and with Matlab_MEX_EXTENSION suffix.

DOCUMENTATION <file>

If given, the <file> will be considered as being the documentation file for the MEX file. This file is copied into the same folder without any processing, with the same name as the final MEX file, and with extension .m. In that case, typing help <name> in MATLAB prints the documentation contained in this file. The documentation file is not processed and should be in the following format:

```
% This is the documentation
function ret = mex_target_output_name(input1)
```

R2017b or R2018a

Added in version 3.14.

May be given to specify the version of the C API to use: R2017b specifies the traditional (separate complex) C API, and corresponds to the -R2017b flag for the mex command. R2018a specifies the new interleaved complex C API, and corresponds to the -R2018a flag for the mex command. Ignored for MATLAB versions prior to R2018a. Defaults to R2017b.

MODULE or SHARED

Added in version 3.7.

May be given to specify the type of library to be created.

EXECUTABLE

Added in version 3.7.

May be given to create an executable instead of a library. If no type is given explicitly, the default type is SHARED.

EXCLUDE_FROM_ALL

This option has the same meaning as the EXCLUDE_FROM_ALL <#prop_tgt:EXCLUDE_FROM_ALL> target property and is forwarded to the add_library() <#command:add_library>, or add_executable() <#command:add_executable> command.

NO_IMPLICIT_LINK_TO_MATLAB_LIBRARIES

Added in version 3.24.

This option permits to disable the automatic linking of MATLAB libraries, so that only the libraries that are actually required can be linked via the LINK_TO option.

matlab_get_mex_suffix

Added in version 3.3.

Returns the extension to be used for the MEX files (the suffix):

```
matlab_get_mex_suffix(<matlab-root> <mex-suffix-var>)
```

The arguments are:

<matlab-root>

The root of MATLAB/MCR installation. For example, the value of the Matlab_ROOT_DIR variable.

<mex-suffix-var>

The name of the variable in which the suffix will be returned.

This command is platform and architecture dependent. It should not be called before the appropriate MATLAB root has been found.

matlab_add_unit_test

Added in version 3.3.

Adds a MATLAB unit test file to the project's test set of CMake/CTest:

```
matlab_add_unit_test(

  NAME <name>

  UNITTEST_FILE <matlab-file-containing-unittest.m>

  [CUSTOM_TEST_COMMAND <matlab-command-to-run-as-test>]

  [UNITTEST_PRECOMMAND <matlab-command-to-run>]

  [TIMEOUT <timeout>]

  [ADDITIONAL_PATH <paths>...]

  [MATLAB_ADDITIONAL_STARTUP_OPTIONS <options>...]

  [TEST_ARGS <args>...]

  [NO_UNITTEST_FRAMEWORK]

  [WORKING_DIRECTORY <dir>]
)
```

By default, the MATLAB unit test framework will be used (>= 2013a) to run the added MATLAB script, but regular .m files returning an exit code can be used as well (0 indicating a success).

This command requires the component MAIN_PROGRAM and hence is not available for an MCR installation.

The unit test uses the MATLAB unittest framework (default, available starting MATLAB 2013b+) except if the option NO_UNITTEST_FRAMEWORK is given.

The command expects one MATLAB test script file to be given. In the case NO_UNITTEST_FRAMEWORK is given, the unittest script file should contain the script to be run, plus an exit command with the exit value. This exit value will be passed to the ctest framework (0 success, non 0 failure). Additional arguments accepted by add_test() <#command:add_test> can be passed through TEST_ARGS (e.g. CONFIGURATIONS <config> ...).

The arguments are:

NAME <name>

The name of the unittest in ctest.

UNITTEST_FILE <matlab-file-containing-unittest.m>

The MATLAB unittest file. Its path will be automatically added to the MATLAB path.

CUSTOM_TEST_COMMAND <matlab-command-to-run-as-test>

MATLAB script command to run as the test. If this is not set, then the following is run: runtests('matlab_file_name'), exit(max([ans(1,:).Failed])) where matlab_file_name is the UNITTEST_FILE without the extension.

UNITTEST_PRECOMMAND <matlab-command-to-run>

MATLAB script command to be ran before the file containing the test (e.g. GPU device initialization based on CMake variables).

TIMEOUT <timeout>

The test timeout in seconds. Defaults to 180 seconds as the MATLAB unit test may hang.

ADDITIONAL_PATH <paths>...

A list of paths to add to the MATLAB path prior to running the unit test.

MATLAB_ADDITIONAL_STARTUP_OPTIONS <options>

A list of additional option in order to run MATLAB from the command line. The -nosplash, -nodesktop, and -nodisplay options are always added automatically.

TEST_ARGS <args>...

Additional options provided to the add_test command. These options are added to the default options (e.g. CONFIGURATIONS Release).

NO_UNITTEST_FRAMEWORK

When set, indicates that the test should not use the unittest framework of MATLAB (available for versions >= R2013a).

WORKING_DIRECTORY <dir>

This will be the working directory for the test. If specified it will also be the output directory used for the log file of the test run. If not specified the temporary directory ${CMAKE_BINARY_DIR}/Matlab will be used as the working directory and the log location.

### Known Issues
Symbol clash in a MEX target

By default, every symbol inside a MEX file defined with the command matlab_add_mex() have hidden visibility, except for the entry point. This is the default behavior of the MEX compiler, which lowers the risk of symbol collision between the libraries shipped with MATLAB, and the libraries to which the MEX file is linking to. This is also the default on Windows platforms. However, this is not sufficient in certain case, where for instance the MEX file is linking against libraries that are already loaded by MATLAB, even if those libraries have different SONAMES. A possible solution is to hide the symbols of the libraries to which the MEX target is linking to. This can be achieved in GNU GCC compilers with the linker option -Wl,--exclude-libs,ALL.

Tests using GPU resources

In case the MEX file is using the GPU and in order to be able to run unit tests on this MEX file, the GPU resources should be properly released by MATLAB. A possible solution is to make MATLAB aware of the use of the GPU resources in the session, which can be performed by a command, such as D = gpuDevice(), at the beginning of the test script (or via a fixture).

### Examples
Finding MATLAB and linking imported target to a project target:

```
find_package(Matlab)
target_link_libraries(example PRIVATE Matlab::mx)
```

### FindMFC
Finds the native Microsoft Foundation Class Library (MFC) for developing MFC applications on Windows:

```
find_package(MFC [...])
```

Note:

MFC is an optional component in Visual Studio and must be installed separately for this module to succeed.

Once the MFC libraries and headers are found, no additional manual linking is needed, as they are part of the development environment.

### Result Variables
This module defines the following variables:

MFC_FOUND

Boolean indicating whether MFC support was found.

### Examples
Using this module to check if the application can link to the MFC libraries:

```
find_package(MFC)
if(MFC_FOUND)

  # Example logic when MFC is available...

  set(CMAKE_MFC_FLAG 2)

  add_executable(app WIN32 main.cpp)

  target_compile_definitions(app PRIVATE _AFXDLL)
endif()
```

### See Also
•

The CMAKE_MFC_FLAG <#variable:CMAKE_MFC_FLAG> variable.

### FindMotif
Finds Motif (or LessTif) graphical user interface toolkit:

```
find_package(Motif [...])
```

### Result Variables
This module defines the following variables:

Motif_FOUND

Added in version 3.3.

Boolean indicating whether Motif was found.

### Cache Variables
The following cache variables may also be set:

MOTIF_INCLUDE_DIR

Include directories needed to use Motif.

MOTIF_LIBRARIES

Libraries needed to link to Motif.

### Deprecated Variables
The following variables are provided for backward compatibility:

MOTIF_FOUND

Deprecated since version 4.2: Use Motif_FOUND, which has the same value.

Boolean indicating whether Motif was found.

### Examples
Finding Motif and creating an imported interface target for linking it to a project target:

```
find_package(Motif)
if(Motif_FOUND AND NOT TARGET Motif::Motif)

  add_library(Motif::Motif INTERFACE IMPORTED)

  set_target_properties(

    Motif::Motif

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${MOTIF_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${MOTIF_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE Motif::Motif)
```

### FindMPEG
Finds the native MPEG library (libmpeg2):

```
find_package(MPEG [...])
```

Note:

This module is functionally identical to the FindMPEG2 <#module:FindMPEG2> module, which also finds the libmpeg2 library. Both modules were introduced in the past to provide flexibility in handling potential differences in future versions of the MPEG library and to maintain backward compatibility across CMake releases. The FindMPEG2 module additionally checks for the SDL dependency and includes it in its usage requirements. For working with libmpeg2, it is recommended to use the FindMPEG2 <#module:FindMPEG2> module instead of this one.

### Result Variables
This module defines the following variables:

MPEG_FOUND

Boolean indicating whether the libmpeg2 library was found.

MPEG_LIBRARIES

Libraries needed to link against to use libmpeg2.

### Cache Variables
The following cache variables may also be set:

MPEG_INCLUDE_DIR

The directory containing the mpeg2.h and related headers needed to use libmpeg2 library.

MPEG_mpeg2_LIBRARY

The path to the libmpeg2 library.

MPEG_vo_LIBRARY

The path to the vo (Video Out) library.

### Examples
Finding libmpeg2 library and creating an imported interface target for linking it to a project target:

```
find_package(MPEG)
if(MPEG_FOUND AND NOT TARGET MPEG::MPEG)

  add_library(MPEG::MPEG INTERFACE IMPORTED)

  set_target_properties(

    MPEG::MPEG

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${MPEG_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${MPEG_INCLUDE_DIR}"

  )
endif()
target_link_libraries(project_target PRIVATE MPEG::MPEG)
```

### FindMPEG2
Finds the native MPEG2 library (libmpeg2):

```
find_package(MPEG2 [...])
```

Note:

Depending on how the native libmpeg2 library is built and installed, it may depend on the SDL (Simple DirectMedia Layer) library. If SDL is found, this module includes it in its usage requirements when used.

### Result Variables
This module defines the following variables:

MPEG2_FOUND

Boolean indicating whether the libmpeg2 library was found.

MPEG2_LIBRARIES

Libraries needed to link against to use libmpeg2.

### Cache Variables
The following cache variables may also be set:

MPEG2_INCLUDE_DIR

The directory containing the mpeg2.h and related headers needed to use libmpeg2 library.

MPEG2_mpeg2_LIBRARY

The path to the libmpeg2 library.

MPEG2_vo_LIBRARY

The path to the vo (Video Out) library.

### Examples
Finding libmpeg2 library and creating an imported interface target for linking it to a project target:

```
find_package(MPEG2)
if(MPEG2_FOUND AND NOT TARGET MPEG2::MPEG2)

  add_library(MPEG2::MPEG2 INTERFACE IMPORTED)

  set_target_properties(

    MPEG2::MPEG2

    PROPERTIES

      INTERFACE_LINK_LIBRARIES "${MPEG2_LIBRARIES}"

      INTERFACE_INCLUDE_DIRECTORIES "${MPEG2_INCLUDE_DIR}"

  )
endif()
target_link_libraries(project_target PRIVATE MPEG2::MPEG2)
```

### FindMPI
Finds a Message Passing Interface (MPI) implementation:

```
find_package(MPI [<version>] [COMPONENTS <langs>...] [...])
```

The Message Passing Interface (MPI) is a library used to write high-performance distributed-memory parallel applications, and is typically deployed on a cluster. MPI is a standard interface (defined by the MPI forum) for which many implementations are available.

Added in version 3.10: Major overhaul of the module: many new variables, per-language components, and support for a wider variety of runtimes.

### Components
This module supports optional components that can be specified with the find_package() <#command:find_package> command to control which MPI languages to search for:

```
find_package(MPI [COMPONENTS <langs>...])
```

Supported components include:

C

Added in version 3.10.

Finds MPI C API.

CXX

Added in version 3.10.

Finds the MPI C API that is usable from C++.

MPICXX

Added in version 3.10.

Finds the MPI-2 C++ API that was removed in MPI-3.

Fortran

Added in version 3.10.

Finds the MPI Fortran API.

If no components are specified, module searches for the C, CXX, and Fortran components automatically, depending on which languages are enabled in the project.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

MPI::MPI_<lang>

Added in version 3.9.

Target encapsulating usage requirements for using MPI from language <lang>, available if MPI is found. The <lang> is a specified component name as listed above.

### Result Variables
This module defines the following variables:

MPI_FOUND

Boolean indicating that MPI settings for all requested components (languages) were found. If no components are specified, this variable is set to boolean true if MPI settings for all enabled languages were detected. Note that the MPICXX component does not affect this variable.

MPI_VERSION

Minimal version of MPI detected among the requested languages, or all enabled languages if no components were specified.

This module will set the following variables per language in CMake project, where <lang> is one of C, CXX, or Fortran:

MPI_<lang>_FOUND

Boolean indicating the MPI settings for <lang> were found and that simple MPI test programs compile with the provided settings.

MPI_<lang>_COMPILER

MPI compiler for <lang> if such a program exists.

MPI_<lang>_COMPILE_OPTIONS

Compilation options for MPI programs in <lang>, given as a semicolon-separated list <#cmake-language-lists>.

MPI_<lang>_COMPILE_DEFINITIONS

Compilation definitions for MPI programs in <lang>, given as a semicolon-separated list <#cmake-language-lists>.

MPI_<lang>_INCLUDE_DIRS

Include path(s) for MPI header.

MPI_<lang>_LINK_FLAGS

Linker flags for MPI programs.

MPI_<lang>_LIBRARIES

All libraries to link MPI programs against.

The following variables indicating which bindings are present will be defined:

MPI_MPICXX_FOUND

Boolean indicating whether the MPI-2 C++ bindings are present (introduced in MPI-2, removed with MPI-3).

MPI_Fortran_HAVE_F77_HEADER

True if the Fortran 77 header <mpif.h> is available.

MPI_Fortran_HAVE_F90_MODULE

True if the Fortran 90 module mpi can be used for accessing MPI (MPI-2 and higher only).

MPI_Fortran_HAVE_F08_MODULE

True if the Fortran 2008 mpi_f08 is available to MPI programs (MPI-3 and higher only).

If possible, the MPI version will be determined by this module. The facilities to detect the MPI version were introduced with MPI-1.2, and therefore cannot be found for older MPI versions.

MPI_<lang>_VERSION

MPI version implemented for <lang> by the MPI distribution.

MPI_<lang>_VERSION_MAJOR

Major version of MPI implemented for <lang> by the MPI distribution.

MPI_<lang>_VERSION_MINOR

Minor version of MPI implemented for <lang> by the MPI distribution.

Note that there's no variable for the C bindings being accessible through <mpi.h>, since the MPI standards always have required this binding to work in both C and C++ code.

For running MPI programs, the module sets the following variables:

MPIEXEC_EXECUTABLE

Executable for running MPI programs, if such exists.

MPIEXEC_NUMPROC_FLAG

Flag to pass to mpiexec before giving it the number of processors to run on.

MPIEXEC_MAX_NUMPROCS

Number of MPI processors to utilize. Defaults to the number of processors detected on the host system.

MPIEXEC_PREFLAGS

Flags to pass to mpiexec directly before the executable to run.

MPIEXEC_POSTFLAGS

Flags to pass to mpiexec after other flags.

### Variables for Locating MPI
This module performs a four-step search for an MPI implementation:

1.

Searches for MPIEXEC_EXECUTABLE and, if found, uses its base directory.

2.

Checks if the compiler has MPI support built-in. This is the case if the user passed a compiler wrapper as CMAKE_<LANG>_COMPILER <#variable:CMAKE_<LANG>_COMPILER> or if they use Cray system compiler wrappers.

3.

Attempts to find an MPI compiler wrapper and determines the compiler information from it.

4.

Tries to find an MPI implementation that does not ship such a wrapper by guessing settings. Currently, only Microsoft MPI and MPICH2 on Windows are supported.

For controlling the MPIEXEC_EXECUTABLE step, the following variables may be set:

MPIEXEC_EXECUTABLE

Manually specify the location of mpiexec.

MPI_HOME

Specify the base directory of the MPI installation.

ENV{MPI_HOME}

Environment variable to specify the base directory of the MPI installation.

ENV{I_MPI_ROOT}

Environment variable to specify the base directory of the MPI installation.

For controlling the compiler wrapper step, the following variables may be set:

MPI_<lang>_COMPILER

Search for the specified compiler wrapper and use it.

MPI_<lang>_COMPILER_FLAGS

Flags to pass to the MPI compiler wrapper during interrogation. Some compiler wrappers support linking debug or tracing libraries if a specific flag is passed and this variable may be used to obtain them.

MPI_COMPILER_FLAGS

Used to initialize MPI_<lang>_COMPILER_FLAGS if no language specific flag has been given. Empty by default.

MPI_EXECUTABLE_SUFFIX

A suffix which is appended to all names that are being looked for. For instance, it may be set to .mpich or .openmpi to prefer the one or the other on Debian and its derivatives.

In order to control the guessing step, the following variable may be set:

MPI_GUESS_LIBRARY_NAME

Valid values are MSMPI and MPICH2. If set, only the given library will be searched for. By default, MSMPI will be preferred over MPICH2 if both are available. This also sets MPI_SKIP_COMPILER_WRAPPER variable to true, which may be overridden.

Each of the search steps may be skipped with the following control variables:

MPI_ASSUME_NO_BUILTIN_MPI

If true, the module assumes that the compiler itself does not provide an MPI implementation and skips to step 2.

MPI_SKIP_COMPILER_WRAPPER

If true, no compiler wrapper will be searched for.

MPI_SKIP_GUESSING

If true, the guessing step will be skipped.

Additionally, the following control variable is available to change search behavior:

MPI_CXX_SKIP_MPICXX

Add some definitions that will disable the MPI-2 C++ bindings. Currently supported are MPICH, Open MPI, Platform MPI and derivatives thereof, for example, MVAPICH or Intel MPI.

If the find procedure fails for the module's internal variable MPI_<lang>_WORKS, then the settings detected by or passed to the module did not work and even a simple MPI test program failed to compile.

If all of these parameters were not sufficient to find the right MPI implementation, a user may disable the entire autodetection process by specifying both a list of libraries in MPI_<lang>_LIBRARIES and a list of include directories in MPI_<lang>_ADDITIONAL_INCLUDE_DIRS. Any other variable may be set in addition to these two. The module will then validate the MPI settings and store the settings in the cache.

### Cache Variables
The variable MPI_<lang>_INCLUDE_DIRS will be assembled from the following variables.

For C and CXX:

MPI_<lang>_HEADER_DIR

Location of the <mpi.h> header on disk.

For Fortran:

MPI_Fortran_F77_HEADER_DIR

Location of the Fortran 77 header <mpif.h>, if it exists.

MPI_Fortran_MODULE_DIR

Location of the mpi or mpi_f08 modules, if available.

For all languages the following variables are additionally considered:

MPI_<lang>_ADDITIONAL_INCLUDE_DIRS

A semicolon-separated list <#cmake-language-lists> of paths needed in addition to the normal include directories.

MPI_<include-name>_INCLUDE_DIR

Path variables for include folders referred to by <include-name>.

MPI_<lang>_ADDITIONAL_INCLUDE_VARS

A semicolon-separated list <#cmake-language-lists> of <include-name> that will be added to the include locations of <lang>.

The variable MPI_<lang>_LIBRARIES will be assembled from the following variables:

MPI_<lib-name>_LIBRARY

The location of a library called <lib-name> for use with MPI.

MPI_<lang>_LIB_NAMES

A semicolon-separated list <#cmake-language-lists> of <lib-name> that will be added to the include locations of <lang>.

### Advanced Variables for Using MPI
The module can perform some advanced feature detections upon explicit request.

Note:

The following checks cannot be performed without executing an MPI test program. Consider the special considerations for the behavior of try_run() <#command:try_run> during cross compilation. Moreover, running an MPI program can cause additional issues, like a firewall notification on some systems. These detections should be only enabled if information is absolutely needed.

If the following variables are set to true, the respective search will be performed:

MPI_DETERMINE_Fortran_CAPABILITIES

Determine for all available Fortran bindings what the values of MPI_SUBARRAYS_SUPPORTED and MPI_ASYNC_PROTECTS_NONBLOCKING are and make their values available as MPI_Fortran_<binding>_SUBARRAYS and MPI_Fortran_<binding>_ASYNCPROT, where <binding> is one of F77_HEADER, F90_MODULE and F08_MODULE.

MPI_DETERMINE_LIBRARY_VERSION

For each language, find the output of MPI_Get_library_version and make it available as MPI_<lang>_LIBRARY_VERSION_STRING. This information is usually tied to the runtime component of an MPI implementation and might differ depending on <lang>. Note that the return value is entirely implementation defined. This information might be used to identify the MPI vendor and for example pick the correct one of multiple third party binaries that matches the MPI vendor.

### Deprecated Variables
The following variables are provided for backward compatibility:

MPI_COMPILER

Deprecated since version 2.8.5: Use the MPI_<lang>_COMPILER instead.

MPI_LIBRARY

Deprecated since version 2.8.5: Use the MPI_<lang>_LIBRARIES instead.

MPI_EXTRA_LIBRARY

Deprecated since version 2.8.5: Use the MPI_<lang>_LIBRARIES instead.

MPI_COMPILE_FLAGS

Deprecated since version 2.8.5: Use MPI_<lang>_COMPILE_OPTIONS and MPI_<lang>_COMPILE_DEFINITIONS instead.

MPI_INCLUDE_PATH

Deprecated since version 2.8.5: Use the MPI_<lang>_INCLUDE_DIRS instead.

MPI_LINK_FLAGS

Deprecated since version 2.8.5: Use the MPI_<lang>_LINK_FLAGS instead.

MPI_LIBRARIES

Deprecated since version 2.8.5: Use the MPI_<lang>_LIBRARIES instead.

MPI_<lang>_COMPILE_FLAGS

Deprecated since version 3.10: Use the MPI_<lang>_COMPILE_OPTIONS and MPI_<lang>_COMPILE_DEFINITIONS instead.

MPI_<lang>_INCLUDE_PATH

Deprecated since version 3.10: For consumption use MPI_<lang>_INCLUDE_DIRS and for specifying folders use MPI_<lang>_ADDITIONAL_INCLUDE_DIRS instead.

MPIEXEC

Deprecated since version 3.10: Use MPIEXEC_EXECUTABLE instead.

### Example: Basic Usage
Finding MPI and linking imported target to project target:

```
find_package(MPI)
target_link_libraries(example PRIVATE MPI::MPI_C)
```

### Example: Usage of mpiexec
When using MPIEXEC_EXECUTABLE to execute MPI applications, typically all of the MPIEXEC_EXECUTABLE flags should be used as follows.

In the following example, the command is executed in a process. <executable> should be replaced with the MPI program, and <args> with the arguments to pass to the MPI program.

```
find_package(MPI)
if(MPI_FOUND)

  execute_process(

    COMMAND

      ${MPIEXEC_EXECUTABLE}

      ${MPIEXEC_NUMPROC_FLAG}

      ${MPIEXEC_MAX_NUMPROCS}

      ${MPIEXEC_PREFLAGS}

      <executable>

      ${MPIEXEC_POSTFLAGS}

      <args>

  )
endif()
```

### FindMsys
Added in version 3.21.

Finds MSYS, a POSIX-compatible environment that runs natively on Microsoft Windows:

```
find_package(Msys [...])
```

Note:

This module is primarily intended for use in other Find Modules <#find-modules> to help locate programs when using the find_*() commands, such as find_program() <#command:find_program>. In most cases, direct use of those commands is sufficient. Use this module only if a specific program is known to be installed via MSYS and is usable from Windows.

### Result Variables
This module defines the following variables:

Msys_FOUND

Added in version 4.2.

Boolean indicating whether MSYS was found.

MSYS_INSTALL_PATH

The path to the MSYS root installation directory.

### Examples
Finding the MSYS installation and using its path in a custom find module:

FindFoo.cmake

```
find_package(Msys)
find_program(Foo_EXECUTABLE NAMES foo PATHS ${MSYS_INSTALL_PATH}/usr/bin)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Foo REQUIRED_VARS Foo_EXECUTABLE)
```

### See Also
•

The FindCygwin <#module:FindCygwin> module to find Cygwin path in a similar way.

### FindODBC
Added in version 3.12.

Finds the Open Database Connectivity (ODBC) library, which implements a standard API for accessing database systems:

```
find_package(ODBC [...])
```

ODBC enables applications to communicate with different database management systems (DBMS) using a common set of functions. Communication with a specific database is handled through ODBC drivers, which the library loads at runtime.

On Windows, when building with Visual Studio, this module assumes the ODBC library is provided by the available Windows SDK.

On Unix-like systems, this module searches for ODBC library provided by unixODBC or iODBC implementations of ODBC API. By default, this module looks for the ODBC config program to determine the ODBC library and include directory, first from unixODBC, then from iODBC. If no config program is found, it searches for ODBC header and library in standard locations.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

ODBC::ODBC

Target encapsulating the ODBC usage requirements, available if ODBC is found.

### Result Variables
This module defines the following variables:

ODBC_FOUND

Boolean indicating whether ODBC was found.

ODBC_INCLUDE_DIRS

Include directories containing headers needed to use ODBC.

ODBC_LIBRARIES

Libraries needed to link against to use ODBC.

### Cache Variables
The following cache variables may also be set:

ODBC_INCLUDE_DIR

The path to the directory containing sql.h and other ODBC headers. May be empty on Windows, where the include directory corresponding to the expected Windows SDK is already available in the compilation environment.

ODBC_LIBRARY

The path to the ODBC library or a library name. On Windows, this may be only a library name, because the library directory corresponding to the expected Windows SDK is already available in the compilation environment.

ODBC_CONFIG

The path to the ODBC config program if found or specified. For example, odbc_config for unixODBC, or iodbc-config for iODBC.

### Limitations

- On Windows, this module does not search for iODBC.

- On Unix-like systems, there is no built-in mechanism to prefer unixODBC over iODBC, or vice versa. To bypass this limitation, explicitly set the ODBC_CONFIG variable to the path of the desired ODBC config program.

- This module does not support searching for or selecting a specific ODBC driver.

### Example: Finding and Using ODBC
Finding ODBC and linking it to a project target:

CMakeLists.txt

```
find_package(ODBC)
target_link_libraries(project_target PRIVATE ODBC::ODBC)
```

### Example: Finding a Custom ODBC Installation
The following examples are for Unix-like systems and demonstrate how to set hint and cache variables during the CMake configuration phase to help this module find a custom ODBC implementation (e.g. one not supported by default).

To specify the installation prefix using CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH>:

```
$ cmake -D CMAKE_PREFIX_PATH=/path/to/odbc-installation -B build
```

Or using the dedicated ODBC_ROOT <#variable:<PackageName>_ROOT> variable:

```
$ cmake -D ODBC_ROOT=/path/to/odbc-installation -B build
```

To manually specify the ODBC config program, if available, so that the ODBC installation can be automatically determined based on the config tool:

```
$ cmake -D ODBC_CONFIG=/path/to/odbc/bin/odbc-config -B build
```

To manually specify the ODBC library and include directory:

```
$ cmake \

    -D ODBC_LIBRARY=/path/to/odbc/lib/libodbc.so \

    -D ODBC_INCLUDE_DIR=/path/to/odbc/include \

    -B build
```

### FindOpenACC
Added in version 3.10.

Finds and detects the OpenACC support in a compiler:

```
find_package(OpenACC [<version>] [...])
```

If the compiler supports OpenACC, the flags required to compile with OpenACC support are returned in variables for the different languages. Currently, only NVHPC, PGI, GNU and Cray compilers are supported.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenACC::OpenACC_<lang>

Added in version 3.16.

Target encapsulating the usage requirements for using OpenACC from <lang>. This target is available only if OpenACC support is found. <lang> is one of C, CXX, or Fortran.

### Result Variables
This module defines the following variables:

OpenACC_FOUND

Added in version 3.25.

Boolean indicating that OpenACC flags for at least one language were found.

This module will set the following variables per language in the project, where <lang> is one of C, CXX, or Fortran:

OpenACC_<lang>_FOUND

Boolean indicating whether OpenACC support for language <lang> was detected.

OpenACC_<lang>_FLAGS

OpenACC compiler flags for <lang>, separated by spaces.

OpenACC_<lang>_OPTIONS

Added in version 3.16.

OpenACC compiler flags for <lang>, as a list. Suitable for usage with target_compile_options or target_link_options.

The module will also try to provide the OpenACC version variables:

OpenACC_<lang>_SPEC_DATE

Date of the OpenACC specification implemented by the <lang> compiler.

OpenACC_<lang>_VERSION_MAJOR

Major version of OpenACC implemented by the <lang> compiler.

OpenACC_<lang>_VERSION_MINOR

Minor version of OpenACC implemented by the <lang> compiler.

OpenACC_<lang>_VERSION

OpenACC version implemented by the <lang> compiler.

The specification date is formatted as given in the OpenACC standard: yyyymm where yyyy and mm represents the year and month of the OpenACC specification implemented by the <lang> compiler.

### Input Variables
This module accepts the following variables:

OpenACC_ACCEL_TARGET=<target>

If set, the correct target accelerator flag set to the <target> will be returned with the OpenACC_<lang>_FLAGS variable.

### Examples
Finding OpenACC support and linking the imported target to a project target:

```
find_package(OpenACC)
target_link_libraries(example PRIVATE OpenACC::OpenACC_C)
```

### FindOpenAL
Finds the Open Audio Library (OpenAL):

```
find_package(OpenAL [...])
```

OpenAL is a cross-platform 3D audio API designed for efficient rendering of multichannel three-dimensional positional audio. It is commonly used in games and multimedia applications to provide immersive and spatialized sound.

Projects using this module should include the OpenAL header file using #include <al.h>, and not #include <AL/al.h>. The reason for this is that the latter is not portable. For example, Windows/Creative Labs does not by default put OpenAL headers in AL/ and macOS uses the convention of <OpenAL/al.h>.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenAL::OpenAL

Added in version 3.25.

Target encapsulating the OpenAL library usage requirements, available only if the OpenAL library is found.

### Result Variables
This module defines the following variables:

OpenAL_FOUND

Added in version 3.3.

Boolean indicating whether OpenAL was found.

### Cache Variables
The following cache variables may also be set:

OPENAL_INCLUDE_DIR

The include directory containing headers needed to use the OpenAL library.

OPENAL_LIBRARY

The path to the OpenAL library.

### Hints
This module accepts the following variables:

OPENALDIR

Environment variable which can be used to set the installation prefix of OpenAL to be found in non-standard locations. OpenAL is searched in the following order:

1.

By default on macOS, system framework is searched first: /System/Library/Frameworks, whose priority can be changed by setting the CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable.

2.

Environment variable ENV{OPENALDIR}.

3.

System paths.

4.

User-compiled framework: ~/Library/Frameworks.

5.

Manually compiled framework: /Library/Frameworks.

6.

Add-on package: /opt.

### Deprecated Variables
The following variables are provided for backward compatibility:

OPENAL_FOUND

Deprecated since version 4.2: Use OpenAL_FOUND, which has the same value.

Boolean indicating whether OpenAL was found.

### Examples
Finding the OpenAL library and linking it to a project target:

```
find_package(OpenAL)
target_link_libraries(project_target PRIVATE OpenAL::OpenAL)
```

### FindOpenCL
Added in version 3.1.

Finds Open Computing Language (OpenCL):

```
find_package(OpenCL [<version>] [...])
```

OpenCL is a framework for writing programs that execute across heterogeneous platforms, such as CPUs, GPUs, and other accelerators.

Added in version 3.24: Detection of OpenCL 3.0.

Added in version 3.10: Detection of OpenCL 2.1 and 2.2.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenCL::OpenCL

Added in version 3.7.

Target encapsulating the OpenCL usage requirements, available if OpenCL has been found.

### Result Variables
This module defines the following variables:

OpenCL_FOUND

Boolean indicating whether (the requested version of) OpenCL was found.

OpenCL_VERSION

Added in version 4.2.

Highest supported OpenCL version found in form of <major>.<minor> (e.g., 1.2).

OpenCL_VERSION_MAJOR

The major version of the OpenCL implementation.

OpenCL_VERSION_MINOR

The minor version of the OpenCL implementation.

OpenCL_INCLUDE_DIRS

Include directories needed to use OpenCL.

OpenCL_LIBRARIES

Libraries needed to link to OpenCL.

### Cache Variables
The following cache variables may also be set:

OpenCL_INCLUDE_DIR

The OpenCL include directory.

OpenCL_LIBRARY

The path to the OpenCL library.

### Deprecated Variables
The following variables are provided for backward compatibility:

OpenCL_VERSION_STRING

Deprecated since version 4.2: Use OpenCL_VERSION, which has the same value.

Highest supported OpenCL version found in form of <major>.<minor>.

### Examples
Finding OpenCL and linking it to a project target:

```
find_package(OpenCL)
target_link_libraries(project_target PRIVATE OpenCL::OpenCL)
```

### FindOpenGL
Finds the OpenGL and OpenGL Utility Library (GLU), for using OpenGL in a CMake project:

```
find_package(OpenGL [COMPONENTS <components>...] [...])
```

OpenGL (Open Graphics Library) is a cross-platform API for rendering 2D and 3D graphics. It is widely used in CAD, games, and visualization software.

- GL refers to the core OpenGL library, which provides the fundamental graphics rendering API.

- GLU (OpenGL Utility Library) is a companion library that offers utility functions built on top of OpenGL, such as tessellation and more complex shape drawing.

Changed in version 3.2: X11 is no longer added as a dependency on Unix/Linux systems.

Added in version 3.10: GLVND (GL Vendor-Neutral Dispatch library) support on Linux. See the Linux-specific section below.

### Components
This module supports optional components which can be specified with the find_package() <#command:find_package> command:

```
find_package(OpenGL [COMPONENTS <components>...])
```

Supported components are:

EGL

Added in version 3.10.

The EGL interface between OpenGL, OpenGL ES and the underlying windowing system.

GLX

Added in version 3.10.

An extension to X that interfaces OpenGL, OpenGL ES with X window system.

OpenGL

Added in version 3.10.

The cross platform API for 3D graphics.

GLES2

Added in version 3.27.

A subset of OpenGL API for embedded systems with limited capabilities.

GLES3

Added in version 3.27.

A subset of OpenGL API for embedded systems with more capabilities.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenGL::GL

Added in version 3.8.

Target encapsulating the usage requirements of platform-specific OpenGL libraries, available if OpenGL is found.

OpenGL::GLU

Added in version 3.8.

Target encapsulating the OpenGL Utility Library (GLU) usage requirements, available if GLU is found.

Additionally, the following GLVND-specific library imported targets are provided:

OpenGL::OpenGL

Added in version 3.10.

Target encapsulating the libOpenGL usage requirements, available if system is GLVND-based and OpenGL is found.

OpenGL::GLX

Added in version 3.10.

Target encapsulating the usage requirements of the OpenGL Extension to the X Window System (GLX), available if OpenGL and GLX are found.

OpenGL::EGL

Added in version 3.10.

Target encapsulating the EGL usage requirements, available if OpenGL and EGL are found.

OpenGL::GLES2

Added in version 3.27.

Target encapsulating the GLES2 usage requirements, available if OpenGL and GLES2 are found.

OpenGL::GLES3

Added in version 3.27.

Target encapsulating the GLES3 usage requirements, available if OpenGL and GLES3 are found.

### Result Variables
This module defines the following variables:

OpenGL_FOUND

Added in version 3.3.

Boolean indicating whether OpenGL and all requested components were found.

OPENGL_XMESA_FOUND

Boolean indicating whether OpenGL XMESA was found.

OPENGL_GLU_FOUND

Boolean indicating whether GLU was found.

OpenGL_OpenGL_FOUND

Added in version 3.10.

Boolean indicating whether the GLVND OpenGL library was found.

OpenGL_GLX_FOUND

Added in version 3.10.

Boolean indicating whether GLVND GLX was found.

OpenGL_EGL_FOUND

Added in version 3.10.

Boolean indicating whether GLVND EGL was found.

OpenGL_GLES2_FOUND

Added in version 3.27.

Boolean indicating whether GLES2 was found.

OpenGL_GLES3_FOUND

Added in version 3.27.

Boolean indicating whether GLES3 was found.

OPENGL_INCLUDE_DIRS

Added in version 3.29.

Paths to the OpenGL include directories.

OPENGL_EGL_INCLUDE_DIRS

Added in version 3.10.

Path to the EGL include directory.

OPENGL_LIBRARIES

Paths to the OpenGL library, windowing system libraries, and GLU libraries. On Linux, this assumes GLX and is never correct for EGL-based targets. Clients are encouraged to use the OpenGL::* imported targets instead.

### Cache Variables
The following cache variables may also be set:

OPENGL_INCLUDE_DIR

The path to the OpenGL include directory. The OPENGL_INCLUDE_DIRS variable is preferred.

OPENGL_GLU_INCLUDE_DIR

Added in version 3.29.

Path to the OpenGL GLU include directory.

OPENGL_egl_LIBRARY

Added in version 3.10.

Path to the GLVND EGL library.

OPENGL_glu_LIBRARY

Path to the GLU library.

OPENGL_glx_LIBRARY

Added in version 3.10.

Path to the GLVND GLX library.

OPENGL_opengl_LIBRARY

Added in version 3.10.

Path to the GLVND OpenGL library

OPENGL_gl_LIBRARY

Path to the OpenGL library.

OPENGL_gles2_LIBRARY

Added in version 3.27.

Path to the OpenGL GLES2 library.

OPENGL_gles3_LIBRARY

Added in version 3.27.

Path to the OpenGL GLES3 library.

### Hints
This module accepts the following variables:

OpenGL_GL_PREFERENCE

Added in version 3.10.

This variable is supported on Linux systems to specify the preferred way to provide legacy GL interfaces in case multiple choices are available. The value may be one of:

GLVND

If the GLVND OpenGL and GLX libraries are available, prefer them. This forces OPENGL_gl_LIBRARY to be empty. Changed in version 3.11: This is the default, unless policy CMP0072 <#policy:CMP0072> is set to OLD and no components are requested (since components correspond to GLVND libraries).

LEGACY

Prefer to use the legacy libGL library, if available. This makes OPENGL_opengl_LIBRARY and OPENGL_glx_LIBRARY point to OPENGL_gl_LIBRARY.

### Linux-specific
Some Linux systems utilize GLVND as a new ABI for OpenGL. GLVND separates context libraries from OpenGL itself; OpenGL lives in "libOpenGL", and contexts are defined in "libGLX" or "libEGL". GLVND is currently the only way to get OpenGL 3+ functionality via EGL in a manner portable across vendors. Projects may use GLVND explicitly with target OpenGL::OpenGL and either OpenGL::GLX or OpenGL::EGL.

Projects may use the OpenGL::GL target (or OPENGL_LIBRARIES variable) to use legacy GL interfaces. Depending on OpenGL_GL_PREFERENCE, these will either use the legacy GL library or the GLVND OpenGL::OpenGL and OpenGL::GLX. Thus, for non-EGL-based Linux targets, the OpenGL::GL target is most portable.

The OpenGL_GL_PREFERENCE variable may be set to specify the preferred way to provide legacy GL interfaces in case multiple choices are available.

For EGL targets the client must rely on GLVND support on the user's system. Linking should use the OpenGL::OpenGL OpenGL::EGL targets. Using GLES* libraries is theoretically possible in place of OpenGL::OpenGL, but this module does not currently support that; contributions welcome.

OPENGL_egl_LIBRARY and OPENGL_EGL_INCLUDE_DIRS are defined in the case of GLVND. For non-GLVND Linux and other systems these are left undefined.

### macOS-Specific
On macOS this module defaults to using the macOS-native framework version of OpenGL. To use the X11 version of OpenGL on macOS, one can disable searching of frameworks using the CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable. For example:

```
find_package(X11)
if(APPLE AND X11_FOUND)

  set(CMAKE_FIND_FRAMEWORK NEVER)

  find_package(OpenGL)

  unset(CMAKE_FIND_FRAMEWORK)
else()

  find_package(OpenGL)
endif()
```

An end user building this project may need to point CMake at their X11 installation, e.g., with -DOpenGL_ROOT=/opt/X11.

### Deprecated Variables
The following variables are provided for backward compatibility:

OPENGL_FOUND

Deprecated since version 4.2: Use OpenGL_FOUND, which has the same value.

Boolean indicating whether OpenGL and all requested components were found.

### Examples
Finding the OpenGL library and linking it to a project target:

```
find_package(OpenGL)
target_link_libraries(project_target PRIVATE OpenGL::OpenGL)
```

### See Also

- The FindGLEW <#module:FindGLEW> module to find OpenGL Extension Wrangler Library (GLEW).

- The FindGLUT <#module:FindGLUT> module to find OpenGL Utility Toolkit (GLUT) library.

- The FindVulkan <#module:FindVulkan> module to find Vulkan graphics API.

### FindOpenMP
Finds Open Multi-Processing (OpenMP) support in a compiler:

```
find_package(OpenMP [<version>] [COMPONENTS <langs>...] [...])
```

If the compiler supports OpenMP, the flags required to compile with OpenMP support are returned in variables for the different languages. The variables may be empty if the compiler does not need a special flag to support OpenMP.

Added in version 3.5: Clang support.

### Components
This module supports components that can be specified using the standard syntax:

```
find_package(OpenMP [COMPONENTS <langs>...])
```

Each of these components controls the various languages to search OpenMP support for. The following components are exposed:

C

Added in version 3.10.

CXX

Added in version 3.10.

Fortran

Added in version 3.10.

CUDA

Added in version 3.31.

The CUDA language component is supported when using a CUDA compiler that supports OpenMP on the host.

If no components are specified, module checks for all of them automatically, depending on the enabled languages in the project.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenMP::OpenMP_<lang>

Added in version 3.9.

Target encapsulating the OpenMP usage requirements for language <lang>.

### Input Variables
The following variables may be set to influence this module's behavior:

OpenMP_RUNTIME_MSVC

Added in version 3.30.

Specify the OpenMP Runtime <https://learn.microsoft.com/en-us/cpp/build/reference/openmp-enable-openmp-2-0-support> when compiling with MSVC. If set to a non-empty value, such as experimental or llvm, it will be passed as the value of the -openmp: flag.

### Result Variables
This module defines the following variables:

OpenMP_FOUND

Added in version 3.10.

Boolean indicating that OpenMP flags for all requested languages were found. If no components are specified, this variable is set to boolean true if OpenMP settings for all enabled languages were detected.

OpenMP_VERSION

Added in version 4.2.

Minimal version of the OpenMP standard detected among the requested languages, or all enabled languages if no components were specified.

This module will set the following variables per language in the project, where <lang> is one of C, CXX, CUDA, or Fortran:

OpenMP_<lang>_FOUND

Added in version 3.9.

Boolean indicating whether the (requested version of) OpenMP support for <lang> was detected.

OpenMP_<lang>_VERSION

Added in version 3.9.

OpenMP version implemented by the <lang> compiler, if available.

OpenMP_<lang>_VERSION_MAJOR

Added in version 3.9.

Major version of OpenMP implemented by the <lang> compiler, if available.

OpenMP_<lang>_VERSION_MINOR

Added in version 3.9.

Minor version of OpenMP implemented by the <lang> compiler, if available.

OpenMP_<lang>_SPEC_DATE

Added in version 3.7.

Date of the OpenMP specification implemented by the <lang> compiler, if available.

The specification date is formatted as given in the OpenMP standard: yyyymm where yyyy and mm represents the year and month of the OpenMP specification implemented by the <lang> compiler.

OpenMP_<lang>_FLAGS

OpenMP compiler flags for <lang>, separated by spaces.

OpenMP_<lang>_INCLUDE_DIRS

Added in version 3.16.

Directories that must be added to the header search path for <lang> when using OpenMP.

For linking with OpenMP code written in <lang>, the following variables are provided:

OpenMP_<lang>_LIB_NAMES

Added in version 3.9.

A semicolon-separated list <#cmake-language-lists> of OpenMP programs libraries for <lang>.

OpenMP_<libname>_LIBRARY

Added in version 3.9.

Location of the individual libraries needed for OpenMP support in <lang>. The <libname> names are stored in the OpenMP_<lang>_LIB_NAMES list.

OpenMP_<lang>_LIBRARIES

Added in version 3.9.

A list of libraries needed to link with OpenMP code written in <lang>.

Specifically for Fortran, the module sets the following variables:

OpenMP_Fortran_HAVE_OMPLIB_HEADER

Added in version 3.9.

Boolean indicating whether OpenMP is accessible through the omp_lib.h Fortran header.

OpenMP_Fortran_HAVE_OMPLIB_MODULE

Added in version 3.9.

Boolean indicating whether OpenMP is accessible through the omp_lib Fortran module.

For some compilers, it may be necessary to add a header search path to find the relevant OpenMP headers. This location may be language-specific. Where this is needed, the module may attempt to find the location, but it can be provided directly by setting the OpenMP_<lang>_INCLUDE_DIR cache variable. Note that this variable is an input control to the module. Project code should use the OpenMP_<lang>_INCLUDE_DIRS output variable if it needs to know what include directories are needed, or preferably the OpenMP::OpenMP_<lang> imported target.

### Examples
Finding OpenMP support and linking the imported target to a project target using the C language component:

```
find_package(OpenMP)
target_link_libraries(project_target PRIVATE OpenMP::OpenMP_C)
```

### FindOpenSceneGraph
Finds OpenSceneGraph <https://openscenegraph.github.io/openscenegraph.io/> (OSG), a 3D graphics application programming interface:

```
find_package(OpenSceneGraph [<version>] [COMPONENTS <components>...] [...])
```

Note:

OpenSceneGraph development has largely transitioned to its successor project, VulkanSceneGraph, which should be preferred for new code. Refer to the upstream documentation for guidance on using VulkanSceneGraph with CMake.

This module searches for the OpenSceneGraph core osg library, its dependency OpenThreads, and additional OpenSceneGraph libraries, some of which are also known as NodeKits, if specified.

When working with OpenSceneGraph, its core library headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
```

Headers for the OpenSceneGraph libraries and NodeKits follow a similar inclusion structure, for example:

example.cxx

```
#include <osgAnimation/Animation>
#include <osgDB/DatabasePager>
#include <osgFX/BumpMapping>
// ...
```

### Components
OpenSceneGraph toolkit consists of the core library osg, and additional libraries, which can be optionally specified as components with the find_package() <#command:find_package> command:

```
find_package(OpenSceneGraph [COMPONENTS <components>...])
```

Supported components include:

osg

Finds the core osg library (libosg), required to use OpenSceneGraph. This component is always automatically implied.

OpenThreads

Finds the dependent OpenThreads library (libOpenThreads) via the FindOpenThreads <#module:FindOpenThreads> module. This component is always automatically implied as it is required to use OpenSceneGraph.

osgAnimation

Finds the osgAnimation library, which provides general purpose utility classes for animation.

osgDB

Finds the osgDB library for reading and writing scene graphs support.

osgFX

Finds the osgFX NodeKit, which provides a framework for implementing special effects.

osgGA

Finds the osgGA (GUI Abstraction) library, which provides facilities to work with varying window systems.

osgIntrospection

Finds the osgIntrospection library, which provides a reflection framework for accessing and invoking class properties and methods at runtime without modifying the classes. Note:

The osgIntrospection library has been removed from the OpenSceneGraph toolkit as of OpenSceneGraph version 3.0.

osgManipulator

Finds the osgManipulator NodeKit, which provides support for 3D interactive manipulators.

osgParticle

Finds the osgParticle NodeKit, which provides support for particle effects.

osgPresentation

Finds the osgPresentation NodeKit, which provides support for 3D scene graph based presentations. Note:

This NodeKit has been added in OpenSceneGraph 3.0.0.

osgProducer

Finds the osgProducer utility library, which provides functionality for window management and event handling. Note:

The osgProducer has been removed from early versions of OpenSceneGraph toolkit 1.x, and has been superseded by the osgViewer library.

osgQt

Finds the osgQt utility library, which provides various classes to aid the integration of Qt. Note:

As of OpenSceneGraph version 3.6, this library has been moved to its own repository.

osgShadow

Finds the osgShadow NodeKit, which provides support for a range of shadow techniques.

osgSim

Finds the osgSim NodeKit, which adds support for simulation features like navigation lights and OpenFlight-style movement controls.

osgTerrain

Finds the osgTerrain NodeKit, which provides geospecifc terrain rendering support.

osgText

Finds the osgText NodeKit, which provides high quality text support.

osgUtil

Finds the osgUtil library, which provides general-purpose utilities like update, cull, and draw traversals, as well as scene graph tools such as optimization, triangle stripping, and tessellation.

osgViewer

Finds the osgViewer library, which provides high level viewer functionality.

osgVolume

Finds the osgVolume NodeKit, which provides volume rendering support.

osgWidget

Finds the osgWidget NodeKit, which provides support for 2D and 3D GUI widget sets.

If no components are specified, this module searches for the osg and OpenThreads components by default.

### Result Variables
This module defines the following variables:

OpenSceneGraph_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) OpenSceneGraph with all specified components was found.

OpenSceneGraph_VERSION

Added in version 4.2.

The version of OpenSceneGraph found.

OPENSCENEGRAPH_INCLUDE_DIRS

Include directories containing headers needed to use OpenSceneGraph.

OPENSCENEGRAPH_LIBRARIES

Libraries needed to link against to use OpenSceneGraph.

### Hints
This module accepts the following variables:

OpenSceneGraph_DEBUG

Set this variable to boolean true to enable debugging output by this module.

OpenSceneGraph_MARK_AS_ADVANCED

Set this variable to boolean true to mark cache variables of this module as advanced automatically.

To help this module find OpenSceneGraph and its various components installed in custom location, CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH> variable can be used. Additionally, the following variables are also respected:

<COMPONENT>_DIR

Environment or CMake variable that can be set to the root of the OSG common installation, where <COMPONENT> is the uppercase form of component listed above. For example, OSGVOLUME_DIR to find the osgVolume component.

OSG_DIR

Environment or CMake variable that can be set to influence detection of OpenSceneGraph installation root location as a whole.

OSGDIR

Environment variable treated the same as OSG_DIR.

OSG_ROOT

Environment variable treated the same as OSG_DIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OPENSCENEGRAPH_FOUND

Deprecated since version 4.2: Use OpenSceneGraph_FOUND, which has the same value.

Boolean indicating whether (the requested version of) OpenSceneGraph with all specified components was found.

OPENSCENEGRAPH_VERSION

Deprecated since version 4.2: Superseded by the OpenSceneGraph_VERSION.

The version of OpenSceneGraph found.

### Examples
Finding the OpenSceneGraph with osgDB and osgUtil libraries specified as components and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(OpenSceneGraph 2.0.0 REQUIRED COMPONENTS osgDB osgUtil)
if(OpenSceneGraph_FOUND AND NOT TARGET OpenSceneGraph::OpenSceneGraph)

  add_library(OpenSceneGraph::OpenSceneGraph INTERFACE IMPORTED)

  set_target_properties(

    OpenSceneGraph::OpenSceneGraph

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OPENSCENEGRAPH_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${OPENSCENEGRAPH_LIBRARIES}"

  )
endif()
add_executable(example example.cxx)
target_link_libraries(example PRIVATE OpenSceneGraph::OpenSceneGraph)
```

### See Also
The following OpenSceneGraph-related helper find modules are used internally by this module when finding specific OpenSceneGraph components. These modules are not intended to be included or invoked directly by project code during typical use of find_package(OpenSceneGraph). However, they can be useful for advanced scenarios where finer control over component detection is needed. For example, to find them explicitly and override or bypass detection of specific OpenSceneGraph components:

- The Findosg <#module:Findosg> module to find the core osg library.

- The FindosgAnimation <#module:FindosgAnimation> module to find osgAnimation.

- The FindosgDB <#module:FindosgDB> module to find osgDB.

- The FindosgFX <#module:FindosgFX> module to find osgDB.

- The FindosgGA <#module:FindosgGA> module to find osgGA.

- The FindosgIntrospection <#module:FindosgIntrospection> module to find osgIntrospection.

- The FindosgManipulator <#module:FindosgManipulator> module to find osgManipulator.

- The FindosgParticle <#module:FindosgParticle> module to find osgParticle.

- The FindosgPresentation <#module:FindosgPresentation> module to find osgPresentation.

- The FindosgProducer <#module:FindosgProducer> module to find osgProducer.

- The FindosgQt <#module:FindosgQt> module to find osgQt.

- The FindosgShadow <#module:FindosgShadow> module to find osgShadow.

- The FindosgSim <#module:FindosgSim> module to find osgSim.

- The FindosgTerrain <#module:FindosgTerrain> module to find osgTerrain.

- The FindosgText <#module:FindosgText> module to find osgText.

- The FindosgUtil <#module:FindosgUtil> module to find osgUtil.

- The FindosgViewer <#module:FindosgViewer> module to find osgViewer.

- The FindosgVolume <#module:FindosgVolume> module to find osgVolume.

- The FindosgWidget <#module:FindosgWidget> module to find osgWidget.

### FindOpenSP
Added in version 3.25.

Finds the OpenSP library:

```
find_package(OpenSP [<version>] [...])
```

OpenSP is an open-source implementation of the SGML (Standard Generalized Markup Language) parser.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenSP::OpenSP

Target encapsulating the OpenSP library usage requirements, available only if the OpenSP is found.

### Result Variables
This module defines the following variables:

OpenSP_FOUND

Boolean indicating whether (the requested version of) OpenSP is available.

OpenSP_VERSION

The version of found OpenSP.

OpenSP_VERSION_MAJOR

The major version of OpenSP.

OpenSP_VERSION_MINOR

The minor version of OpenSP.

OpenSP_VERSION_PATCH

The patch version of OpenSP.

OpenSP_INCLUDE_DIRS

The include directories containing headers needed to use the OpenSP library.

OpenSP_LIBRARIES

Libraries required to link against to use OpenSP. These can be passed to the target_link_libraries() <#command:target_link_libraries> command when not using the OpenSP::OpenSP imported target.

### Cache Variables
The following cache variables may also be set:

OpenSP_INCLUDE_DIR

The OpenSP include directory.

OpenSP_LIBRARY

The absolute path of the osp library.

OpenSP_MULTI_BYTE

True if SP_MULTI_BYTE was found to be defined in OpenSP's config.h header file, which indicates that the OpenSP library was compiled with support for multi-byte characters. The consuming target needs to define the SP_MULTI_BYTE preprocessor macro to match this value in order to avoid issues with character decoding.

### Examples
Finding the OpenSP library and linking it to a project target:

```
find_package(OpenSP)
target_link_libraries(project_target PRIVATE OpenSP::OpenSP)
```

### FindOpenSSL
Finds the installed OpenSSL encryption library and determines its version:

```
find_package(OpenSSL [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.20: Support for specifying version range when calling the find_package() <#command:find_package> command. When a version is requested, it can be specified as a single value as before, and now also a version range can be used. For a detailed description of version range usage and capabilities, refer to the find_package() <#command:find_package> command.

Added in version 3.18: Support for OpenSSL 3.0.

### Components
This module supports the following optional components:

Crypto

Added in version 3.12.

Ensures that the OpenSSL crypto library is found.

SSL

Added in version 3.12.

Ensures that the OpenSSL ssl library is found.

Components can be optionally specified using a standard syntax:

```
find_package(OpenSSL [COMPONENTS <components>...])
```

If no components are requested, module by default searches for the Crypto as required and SSL as optional component.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

OpenSSL::Crypto

Added in version 3.4.

Target encapsulating the OpenSSL crypto library usage requirements, available only if the crypto library is found.

OpenSSL::SSL

Added in version 3.4.

Target encapsulating the OpenSSL ssl library usage requirements, available only if the ssl library is found. For convenience, this target also links OpenSSL::Crypto, since the ssl library depends on the crypto library.

OpenSSL::applink

Added in version 3.18.

Target encapsulating the OpenSSL application-side interface (openssl/applink.c) usage requirements, available only if OpenSSL is found and its version is at least 0.9.8.

This interface provides a glue between OpenSSL BIO layer and the Windows compiler runtime environment and may need to be compiled into projects when using MSVC. By linking this target, the other OpenSSL imported targets can be linked even if the project uses different MSVC runtime configuration. Linking this target on platforms other than MSVC has no effect.

Note:

The interface file is added using the INTERFACE_SOURCES <#prop_tgt:INTERFACE_SOURCES> target property. Due to how interface sources are propagated in CMake, it is recommended to link the OpenSSL::applink target as PRIVATE <#target-command-scope> to ensure that it is linked only once in the entire dependency graph of any library or executable:

```
target_link_libraries(project_target PRIVATE OpenSSL::applink)
```

Using other scopes for this target specifically can lead to unexpected issues during the build or link process, as both the ISO C and ISO C++ standards place very few requirements on how linking should behave.

### Result Variables
This module defines the following variables:

OpenSSL_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) OpenSSL library was found.

OpenSSL_VERSION

Added in version 4.2.

The OpenSSL version found. This is set to <major>.<minor>.<revision><patch> (e.g., 0.9.8s).

OPENSSL_INCLUDE_DIR

The OpenSSL include directory.

OPENSSL_CRYPTO_LIBRARY

The OpenSSL crypto library.

OPENSSL_CRYPTO_LIBRARIES

The OpenSSL crypto library and its dependencies.

OPENSSL_SSL_LIBRARY

The OpenSSL ssl library.

OPENSSL_SSL_LIBRARIES

The OpenSSL ssl library and its dependencies.

OPENSSL_LIBRARIES

All OpenSSL libraries and their dependencies.

OPENSSL_APPLINK_SOURCE

The sources in the target OpenSSL::applink mentioned above. This variable is only defined if found OpenSSL version is at least 0.9.8 and the platform is MSVC.

### Hints
This module accepts the following variables to control the search behavior:

OPENSSL_ROOT_DIR

Set to the root directory of an OpenSSL installation to search for the OpenSSL libraries in custom locations.

OPENSSL_USE_STATIC_LIBS

Added in version 3.4.

Set to TRUE to prefer static OpenSSL libraries over shared ones.

OPENSSL_MSVC_STATIC_RT

Added in version 3.5.

Set to TRUE to search for the OpenSSL libraries built with the MSVC static runtime (MT).

ENV{PKG_CONFIG_PATH}

On UNIX-like systems, pkg-config is used to locate OpenSSL. Set the PKG_CONFIG_PATH environment variable to specify alternate locations, which is useful on systems with multiple library installations.

### Deprecated Variables
The following variables are provided for backward compatibility:

OPENSSL_FOUND

Deprecated since version 4.2: Use OpenSSL_FOUND, which has the same value.

Boolean indicating whether the (requested version of) OpenSSL library was found.

OPENSSL_VERSION

Deprecated since version 4.2: Superseded by the OpenSSL_VERSION.

The version of OpenSSL found.

### Examples
Finding the OpenSSL crypto library and linking it to a project target:

```
find_package(OpenSSL)
target_link_libraries(project_target PRIVATE OpenSSL::Crypto)
```

The following example shows how to find the OpenSSL crypto and ssl libraries and link them to a project target. The SSL component is explicitly specified to ensure that the find module reports an error if the ssl library is not found:

```
find_package(OpenSSL COMPONENTS SSL)
target_link_libraries(project_target PRIVATE OpenSSL::SSL)
```

### FindOpenThreads
Finds the OpenThreads C++ based threading library:

```
find_package(OpenThreads [...])
```

OpenThreads header files are intended to be included as:

example.cxx

```
#include <OpenThreads/Thread>
```

### Result Variables
This module defines the following variables:

OpenThreads_FOUND

Added in version 3.3.

Boolean indicating whether the OpenThreads library was found.

OPENTHREADS_LIBRARY

Libraries needed to link against to use OpenThreads. This provides either release (optimized) or debug library variant, which are found separately depending on the project's Build Configurations <#build-configurations>.

### Cache Variables
The following cache variables may also be set:

OPENTHREADS_INCLUDE_DIR

The directory containing the header files needed to use OpenThreads.

### Hints
This module accepts the following variables:

OPENTHREADS_DIR

An environment or CMake variable that can be set to help find an OpenThreads library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing OpenThreads library: ./configure --prefix=$OPENTHREADS_DIR.

This module was originally introduced to support the FindOpenSceneGraph <#module:FindOpenSceneGraph> module and its components. To simplify one-step automated configuration and builds when the OpenSceneGraph package is developed and distributed upstream, this module supports additional environment variables to find dependencies in specific locations. This approach is used by upstream package over specifying -DVAR=value on the command line because it offers better isolation from internal changes to the module and allows more flexibility when specifying individual OSG components independently of the CMAKE_*_PATH variables. Explicit -DVAR=value arguments can still override these settings if needed. Since OpenThreads is an optional standalone dependency of OpenSceneGraph, this module also honors the following variables for convenience:

OSG_DIR

May be set as an environment or CMake variable. Treated the same as OPENTHREADS_DIR.

OSGDIR

Environment variable treated the same as OPENTHREADS_DIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OPENTHREADS_FOUND

Deprecated since version 4.2: Use OpenThreads_FOUND, which has the same value.

Boolean indicating whether the OpenThreads library was found.

### Examples
Finding the OpenThreads library and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(OpenThreads)
if(OpenThreads_FOUND AND NOT TARGET OpenThreads::OpenThreads)

  add_library(OpenThreads::OpenThreads INTERFACE IMPORTED)

  set_target_properties(

    OpenThreads::OpenThreads

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OPENTHREADS_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OPENTHREADS_LIBRARY}"

  )
endif()
target_link_libraries(example PRIVATE OpenThreads::OpenThreads)
```

### Findosg
Finds the core OpenSceneGraph osg library (libosg).

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead, which automatically finds the osg core library along with its required dependencies like OpenThreads:

```
find_package(OpenSceneGraph)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osg library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed, such as explicitly finding osg library or bypassing automatic component detection:

```
find_package(osg)
```

OpenSceneGraph core library headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osg_FOUND

Added in version 3.3.

Boolean indicating whether the osg library was found.

OSG_LIBRARIES

The libraries needed to link against to use osg library.

OSG_LIBRARY

A result variable that is set to the same value as the OSG_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSG_INCLUDE_DIR

The include directory containing headers needed to use osg library.

OSG_LIBRARY_DEBUG

The path to the osg debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osg library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSG_FOUND

Deprecated since version 4.2: Use osg_FOUND, which has the same value.

Boolean indicating whether the osg library was found.

### Examples
Finding the osg library explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osg)
if(osg_FOUND AND NOT TARGET osg::osg)

  add_library(osg::osg INTERFACE IMPORTED)

  set_target_properties(

    osg::osg

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSG_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSG_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osg::osg)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgAnimation
Finds the osgAnimation library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgAnimation as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgAnimation)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgAnimation library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgAnimation explicitly or bypass automatic component detection:

```
find_package(osgAnimation)
```

OpenSceneGraph and osgAnimation headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgAnimation/Animation>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgAnimation_FOUND

Added in version 3.3.

Boolean indicating whether the osgAnimation library of the OpenSceneGraph toolkit was found.

OSGANIMATION_LIBRARIES

The libraries needed to link against to use osgAnimation.

OSGANIMATION_LIBRARY

A result variable that is set to the same value as the OSGANIMATION_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGANIMATION_INCLUDE_DIR

The include directory containing headers needed to use osgAnimation.

OSGANIMATION_LIBRARY_DEBUG

The path to the osgAnimation debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgAnimation library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGANIMATION_FOUND

Deprecated since version 4.2: Use osgAnimation_FOUND, which has the same value.

Boolean indicating whether the osgAnimation library of the OpenSceneGraph toolkit was found.

### Examples
Finding the osgAnimation library explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgAnimation)
if(osgAnimation_FOUND AND NOT TARGET osgAnimation::osgAnimation)

  add_library(osgAnimation::osgAnimation INTERFACE IMPORTED)

  set_target_properties(

    osgAnimation::osgAnimation

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGANIMATION_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGANIMATION_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgAnimation::osgAnimation)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgDB
Finds the osgDB library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgDB as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgDB)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgDB library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgDB explicitly or bypass automatic component detection:

```
find_package(osgDB)
```

OpenSceneGraph and osgDB headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgDB/DatabasePager>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgDB_FOUND

Added in version 3.3.

Boolean indicating whether the osgDB library of the OpenSceneGraph toolkit was found.

OSGDB_LIBRARIES

The libraries needed to link against to use osgDB.

OSGDB_LIBRARY

A result variable that is set to the same value as the OSGDB_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGDB_INCLUDE_DIR

The include directory containing headers needed to use osgDB.

OSGDB_LIBRARY_DEBUG

The path to the osgDB debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgDB library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGDB_FOUND

Deprecated since version 4.2: Use osgDB_FOUND, which has the same value.

Boolean indicating whether the osgDB library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgDB explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgDB)
if(osgDB_FOUND AND NOT TARGET osgDB::osgDB)

  add_library(osgDB::osgDB INTERFACE IMPORTED)

  set_target_properties(

    osgDB::osgDB

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGDB_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGDB_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgDB::osgDB)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgFX
Finds the osgFX NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgFX as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgFX)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgFX NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgFX explicitly or bypass automatic component detection:

```
find_package(osgFX)
```

OpenSceneGraph and osgFX headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgFX/BumpMapping>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgFX_FOUND

Added in version 3.3.

Boolean indicating whether the osgFX NodeKit of the OpenSceneGraph toolkit was found.

OSGFX_LIBRARIES

The libraries needed to link against to use osgFX.

OSGFX_LIBRARY

A result variable that is set to the same value as the OSGFX_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGFX_INCLUDE_DIR

The include directory containing headers needed to use osgFX.

OSGFX_LIBRARY_DEBUG

The path to the osgFX debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgFX NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGFX_FOUND

Deprecated since version 4.2: Use osgFX_FOUND, which has the same value.

Boolean indicating whether the osgFX NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgFX explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgFX)
if(osgFX_FOUND AND NOT TARGET osgFX::osgFX)

  add_library(osgFX::osgFX INTERFACE IMPORTED)

  set_target_properties(

    osgFX::osgFX

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGFX_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGFX_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgFX::osgFX)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgGA
Finds the osgGA library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgGA as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgGA)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgGA library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgGA explicitly or bypass automatic component detection:

```
find_package(osgGA)
```

OpenSceneGraph and osgGA headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgGA/FlightManipulator>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgGA_FOUND

Added in version 3.3.

Boolean indicating whether the osgGA library of the OpenSceneGraph toolkit was found.

OSGGA_LIBRARIES

The libraries needed to link against to use osgGA.

OSGGA_LIBRARY

A result variable that is set to the same value as the OSGGA_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGGA_INCLUDE_DIR

The include directory containing headers needed to use osgGA.

OSGGA_LIBRARY_DEBUG

The path to the osgGA debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgGA library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGGA_FOUND

Deprecated since version 4.2: Use osgGA_FOUND, which has the same value.

Boolean indicating whether the osgGA library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgGA explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgGA)
if(osgGA_FOUND AND NOT TARGET osgGA::osgGA)

  add_library(osgGA::osgGA INTERFACE IMPORTED)

  set_target_properties(

    osgGA::osgGA

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGGA_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGGA_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgGA::osgGA)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgIntrospection
Finds the osgIntrospection library from the OpenSceneGraph toolkit.

Note:

The osgIntrospection library has been removed from the OpenSceneGraph toolkit as of OpenSceneGraph version 3.0.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgIntrospection as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgIntrospection)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgIntrospection library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgIntrospection explicitly or bypass automatic component detection:

```
find_package(osgIntrospection)
```

OpenSceneGraph and osgIntrospection headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgIntrospection/Reflection>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgIntrospection_FOUND

Added in version 3.3.

Boolean indicating whether the osgIntrospection library of the OpenSceneGraph toolkit was found.

OSGINTROSPECTION_LIBRARIES

The libraries needed to link against to use osgIntrospection.

OSGINTROSPECTION_LIBRARY

A result variable that is set to the same value as the OSGINTROSPECTION_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGINTROSPECTION_INCLUDE_DIR

The include directory containing headers needed to use osgIntrospection.

OSGINTROSPECTION_LIBRARY_DEBUG

The path to the osgIntrospection debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgIntrospection library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGINTROSPECTION_FOUND

Deprecated since version 4.2: Use osgIntrospection_FOUND, which has the same value.

Boolean indicating whether the osgIntrospection library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgIntrospection explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgIntrospection)
if(osgIntrospection_FOUND AND NOT TARGET osgIntrospection::osgIntrospection)

  add_library(osgIntrospection::osgIntrospection INTERFACE IMPORTED)

  set_target_properties(

    osgIntrospection::osgIntrospection

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGINTROSPECTION_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGINTROSPECTION_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgIntrospection::osgIntrospection)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgManipulator
Finds the osgManipulator NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgManipulator as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgManipulator)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgManipulator NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgManipulator explicitly or bypass automatic component detection:

```
find_package(osgManipulator)
```

OpenSceneGraph and osgManipulator headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgManipulator/TrackballDragger>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgManipulator_FOUND

Added in version 3.3.

Boolean indicating whether the osgManipulator NodeKit of the OpenSceneGraph toolkit was found.

OSGMANIPULATOR_LIBRARIES

The libraries needed to link against to use osgManipulator.

OSGMANIPULATOR_LIBRARY

A result variable that is set to the same value as the OSGMANIPULATOR_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGMANIPULATOR_INCLUDE_DIR

The include directory containing headers needed to use osgManipulator.

OSGMANIPULATOR_LIBRARY_DEBUG

The path to the osgManipulator debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgManipulator NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGMANIPULATOR_FOUND

Deprecated since version 4.2: Use osgManipulator_FOUND, which has the same value.

Boolean indicating whether the osgManipulator NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgManipulator explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgManipulator)
if(osgManipulator_FOUND AND NOT TARGET osgManipulator::osgManipulator)

  add_library(osgManipulator::osgManipulator INTERFACE IMPORTED)

  set_target_properties(

    osgManipulator::osgManipulator

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGMANIPULATOR_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGMANIPULATOR_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgManipulator::osgManipulator)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgParticle
Finds the osgParticle NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgParticle as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgParticle)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgParticle NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgParticle explicitly or bypass automatic component detection:

```
find_package(osgParticle)
```

OpenSceneGraph and osgParticle headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgParticle/FireEffect>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgParticle_FOUND

Added in version 3.3.

Boolean indicating whether the osgParticle NodeKit of the OpenSceneGraph toolkit was found.

OSGPARTICLE_LIBRARIES

The libraries needed to link against to use the osgParticle NodeKit

OSGPARTICLE_LIBRARY

A result variable that is set to the same value as the OSGPARTICLE_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGPARTICLE_INCLUDE_DIR

The include directory containing headers needed to use osgParticle NodeKit.

OSGPARTICLE_LIBRARY_DEBUG

The path to the osgParticle debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgParticle NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGPARTICLE_FOUND

Deprecated since version 4.2: Use osgParticle_FOUND, which has the same value.

Boolean indicating whether the osgParticle NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgParticle explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgParticle)
if(osgParticle_FOUND AND NOT TARGET osgParticle::osgParticle)

  add_library(osgParticle::osgParticle INTERFACE IMPORTED)

  set_target_properties(

    osgParticle::osgParticle

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGPARTICLE_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGPARTICLE_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgParticle::osgParticle)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgPresentation
Finds the osgPresentation NodeKit from the OpenSceneGraph toolkit, available since OpenSceneGraph version 3.0.0.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgPresentation as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgPresentation)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgPresentation NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgPresentation explicitly or bypass automatic component detection:

```
find_package(osgPresentation)
```

OpenSceneGraph and osgPresentation headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgPresentation/SlideEventHandler>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgPresentation_FOUND

Added in version 3.3.

Boolean indicating whether the osgPresentation NodeKit of the OpenSceneGraph toolkit was found.

OSGPRESENTATION_LIBRARIES

The libraries needed to link against to use osgPresentation.

OSGPRESENTATION_LIBRARY

A result variable that is set to the same value as the OSGPRESENTATION_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGPRESENTATION_INCLUDE_DIR

The include directory containing headers needed to use osgPresentation.

OSGPRESENTATION_LIBRARY_DEBUG

The path to the osgPresentation debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgPresentation NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGPRESENTATION_FOUND

Deprecated since version 4.2: Use osgPresentation_FOUND, which has the same value.

Boolean indicating whether the osgPresentation NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgPresentation explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgPresentation)
if(osgPresentation_FOUND AND NOT TARGET osgPresentation::osgPresentation)

  add_library(osgPresentation::osgPresentation INTERFACE IMPORTED)

  set_target_properties(

    osgPresentation::osgPresentation

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGPRESENTATION_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGPRESENTATION_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgPresentation::osgPresentation)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgProducer
Finds the osgProducer utility library from the OpenSceneGraph toolkit.

Note:

The osgProducer library has been removed from the OpenSceneGraph toolkit in early OpenSceneGraph versions (pre 1.0 release) and replaced with osgViewer. Its development has shifted at time to a standalone project and repository Producer, which can be found with FindProducer <#module:FindProducer> module.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgProducer as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgProducer)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgProducer library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgProducer explicitly or bypass automatic component detection:

```
find_package(osgProducer)
```

OpenSceneGraph and osgProducer headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgProducer/OsgSceneHandler>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgProducer_FOUND

Added in version 3.3.

Boolean indicating whether the osgProducer library of the OpenSceneGraph toolkit was found.

OSGPRODUCER_LIBRARIES

The libraries needed to link against to use osgProducer.

OSGPRODUCER_LIBRARY

A result variable that is set to the same value as the OSGPRODUCER_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGPRODUCER_INCLUDE_DIR

The include directory containing headers needed to use osgProducer.

OSGPRODUCER_LIBRARY_DEBUG

The path to the osgProducer debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgProducer library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGPRODUCER_FOUND

Deprecated since version 4.2: Use osgProducer_FOUND, which has the same value.

Boolean indicating whether the osgProducer library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgProducer explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgProducer)
if(osgProducer_FOUND AND NOT TARGET osgProducer::osgProducer)

  add_library(osgProducer::osgProducer INTERFACE IMPORTED)

  set_target_properties(

    osgProducer::osgProducer

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGPRODUCER_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGPRODUCER_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgProducer::osgProducer)
```

### See Also

- The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

- The FindProducer <#module:FindProducer> module, which finds the standalone Producer library that evolved from the legacy osgProducer.

### FindosgQt
Finds the osgQt utility library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgQt as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgQt)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgQt library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgQt explicitly or bypass automatic component detection:

```
find_package(osgQt)
```

OpenSceneGraph and osgQt headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgQt/GraphicsWindowQt>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgQt_FOUND

Added in version 3.3.

Boolean indicating whether the osgQt library of the OpenSceneGraph toolkit was found.

OSGQT_LIBRARIES

The libraries needed to link against to use osgQt.

OSGQT_LIBRARY

A result variable that is set to the same value as the OSGQT_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGQT_INCLUDE_DIR

The include directory containing headers needed to use osgQt.

OSGQT_LIBRARY_DEBUG

The path to the osgQt debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgQt library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGQT_FOUND

Deprecated since version 4.2: Use osgQt_FOUND, which has the same value.

Boolean indicating whether the osgQt library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgQt explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgQt)
if(osgQt_FOUND AND NOT TARGET osgQt::osgQt)

  add_library(osgQt::osgQt INTERFACE IMPORTED)

  set_target_properties(

    osgQt::osgQt

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGQT_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGQT_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgQt::osgQt)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgShadow
Finds the osgShadow NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgShadow as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgShadow)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgShadow NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgShadow explicitly or bypass automatic component detection:

```
find_package(osgShadow)
```

OpenSceneGraph and osgShadow headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgShadow/ShadowTexture>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgShadow_FOUND

Added in version 3.3.

Boolean indicating whether the osgShadow NodeKit of the OpenSceneGraph toolkit was found.

OSGSHADOW_LIBRARIES

The libraries needed to link against to use osgShadow.

OSGSHADOW_LIBRARY

A result variable that is set to the same value as the OSGSHADOW_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGSHADOW_INCLUDE_DIR

The include directory containing headers needed to use osgShadow.

OSGSHADOW_LIBRARY_DEBUG

The path to the osgShadow debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgShadow NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGSHADOW_FOUND

Deprecated since version 4.2: Use osgShadow_FOUND, which has the same value.

Boolean indicating whether the osgShadow NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgShadow explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgShadow)
if(osgShadow_FOUND AND NOT TARGET osgShadow::osgShadow)

  add_library(osgShadow::osgShadow INTERFACE IMPORTED)

  set_target_properties(

    osgShadow::osgShadow

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGSHADOW_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGSHADOW_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgShadow::osgShadow)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgSim
Finds the osgSim NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgSim as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgSim)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgSim NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgSim explicitly or bypass automatic component detection:

```
find_package(osgSim)
```

OpenSceneGraph and osgSim headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgSim/ImpostorSprite>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgSim_FOUND

Added in version 3.3.

Boolean indicating whether the osgSim NodeKit of the OpenSceneGraph toolkit was found.

OSGSIM_LIBRARIES

The libraries needed to link against to use osgSim.

OSGSIM_LIBRARY

A result variable that is set to the same value as the OSGSIM_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGSIM_INCLUDE_DIR

The include directory containing headers needed to use osgSim.

OSGSIM_LIBRARY_DEBUG

The path to the osgSim debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgSim NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGSIM_FOUND

Deprecated since version 4.2: Use osgSim_FOUND, which has the same value.

Boolean indicating whether the osgSim NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgSim explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgSim)
if(osgSim_FOUND AND NOT TARGET osgSim::osgSim)

  add_library(osgSim::osgSim INTERFACE IMPORTED)

  set_target_properties(

    osgSim::osgSim

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGSIM_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGSIM_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgSim::osgSim)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgTerrain
Finds the osgTerrain NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgTerrain as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgTerrain)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgTerrain NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgTerrain explicitly or bypass automatic component detection:

```
find_package(osgTerrain)
```

OpenSceneGraph and osgTerrain headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgTerrain/Terrain>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgTerrain_FOUND

Added in version 3.3.

Boolean indicating whether the osgTerrain NodeKit of the OpenSceneGraph toolkit was found.

OSGTERRAIN_LIBRARIES

The libraries needed to link against to use osgTerrain.

OSGTERRAIN_LIBRARY

A result variable that is set to the same value as the OSGTERRAIN_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGTERRAIN_INCLUDE_DIR

The include directory containing headers needed to use osgTerrain.

OSGTERRAIN_LIBRARY_DEBUG

The path to the osgTerrain debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgTerrain NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGTERRAIN_FOUND

Deprecated since version 4.2: Use osgTerrain_FOUND, which has the same value.

Boolean indicating whether the osgTerrain NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgTerrain explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgTerrain)
if(osgTerrain_FOUND AND NOT TARGET osgTerrain::osgTerrain)

  add_library(osgTerrain::osgTerrain INTERFACE IMPORTED)

  set_target_properties(

    osgTerrain::osgTerrain

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGTERRAIN_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGTERRAIN_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgTerrain::osgTerrain)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgText
Finds the osgText NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgText as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgText)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgText NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgText explicitly or bypass automatic component detection:

```
find_package(osgText)
```

OpenSceneGraph and osgText headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgText/Text>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgText_FOUND

Added in version 3.3.

Boolean indicating whether the osgText NodeKit of the OpenSceneGraph toolkit was found.

OSGTEXT_LIBRARIES

The libraries needed to link against to use osgText.

OSGTEXT_LIBRARY

A result variable that is set to the same value as the OSGTEXT_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGTEXT_INCLUDE_DIR

The include directory containing headers needed to use osgText.

OSGTEXT_LIBRARY_DEBUG

The path to the osgText debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgText NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGTEXT_FOUND

Deprecated since version 4.2: Use osgText_FOUND, which has the same value.

Boolean indicating whether the osgText NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgText explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgText)
if(osgText_FOUND AND NOT TARGET osgText::osgText)

  add_library(osgText::osgText INTERFACE IMPORTED)

  set_target_properties(

    osgText::osgText

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGTEXT_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGTEXT_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgText::osgText)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgUtil
Finds the osgUtil library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgUtil as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgUtil)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgUtil library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgUtil explicitly or bypass automatic component detection:

```
find_package(osgUtil)
```

OpenSceneGraph and osgUtil headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgUtil/SceneView>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgUtil_FOUND

Added in version 3.3.

Boolean indicating whether the osgUtil library of the OpenSceneGraph toolkit was found.

OSGUTIL_LIBRARIES

The libraries needed to link against to use osgUtil.

OSGUTIL_LIBRARY

A result variable that is set to the same value as the OSGUTIL_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGUTIL_INCLUDE_DIR

The include directory containing headers needed to use osgUtil.

OSGUTIL_LIBRARY_DEBUG

The path to the osgUtil debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgUtil library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGUTIL_FOUND

Deprecated since version 4.2: Use osgUtil_FOUND, which has the same value.

Boolean indicating whether the osgUtil library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgUtil explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgUtil)
if(osgUtil_FOUND AND NOT TARGET osgUtil::osgUtil)

  add_library(osgUtil::osgUtil INTERFACE IMPORTED)

  set_target_properties(

    osgUtil::osgUtil

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGUTIL_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGUTIL_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgUtil::osgUtil)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgViewer
Finds the osgViewer library from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgViewer as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgViewer)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgViewer library. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgViewer explicitly or bypass automatic component detection:

```
find_package(osgViewer)
```

OpenSceneGraph and osgViewer headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgViewer/Viewer>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgViewer_FOUND

Added in version 3.3.

Boolean indicating whether the osgViewer library of the OpenSceneGraph toolkit was found.

OSGVIEWER_LIBRARIES

The libraries needed to link against to use osgViewer.

OSGVIEWER_LIBRARY

A result variable that is set to the same value as the OSGVIEWER_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGVIEWER_INCLUDE_DIR

The include directory containing headers needed to use osgViewer.

OSGVIEWER_LIBRARY_DEBUG

The path to the osgViewer debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgViewer library, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGVIEWER_FOUND

Deprecated since version 4.2: Use osgViewer_FOUND, which has the same value.

Boolean indicating whether the osgViewer library of the OpenSceneGraph toolkit was found.

### Examples
Finding osgViewer explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgViewer)
if(osgViewer_FOUND AND NOT TARGET osgViewer::osgViewer)

  add_library(osgViewer::osgViewer INTERFACE IMPORTED)

  set_target_properties(

    osgViewer::osgViewer

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGVIEWER_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGVIEWER_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgViewer::osgViewer)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgVolume
Finds the osgVolume NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgVolume as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgVolume)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgVolume NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgVolume explicitly or bypass automatic component detection:

```
find_package(osgVolume)
```

OpenSceneGraph and osgVolume headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgVolume/Volume>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgVolume_FOUND

Added in version 3.3.

Boolean indicating whether the osgVolume NodeKit of the OpenSceneGraph toolkit was found.

OSGVOLUME_LIBRARIES

The libraries needed to link against to use osgVolume.

OSGVOLUME_LIBRARY

A result variable that is set to the same value as the OSGVOLUME_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGVOLUME_INCLUDE_DIR

The include directory containing headers needed to use osgVolume.

OSGVOLUME_LIBRARY_DEBUG

The path to the osgVolume debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgVolume NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGVOLUME_FOUND

Deprecated since version 4.2: Use osgVolume_FOUND, which has the same value.

Boolean indicating whether the osgVolume NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgVolume explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgVolume)
if(osgVolume_FOUND AND NOT TARGET osgVolume::osgVolume)

  add_library(osgVolume::osgVolume INTERFACE IMPORTED)

  set_target_properties(

    osgVolume::osgVolume

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGVOLUME_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGVOLUME_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgVolume::osgVolume)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindosgWidget
Finds the osgWidget NodeKit from the OpenSceneGraph toolkit.

Note:

In most cases, it's recommended to use the FindOpenSceneGraph <#module:FindOpenSceneGraph> module instead and list osgWidget as a component. This will automatically handle dependencies such as the OpenThreads and core osg libraries:

```
find_package(OpenSceneGraph COMPONENTS osgWidget)
```

This module is used internally by FindOpenSceneGraph <#module:FindOpenSceneGraph> to find the osgWidget NodeKit. It is not intended to be included directly during typical use of the find_package() <#command:find_package> command. However, it is available as a standalone module for advanced use cases where finer control over detection is needed. For example, to find the osgWidget explicitly or bypass automatic component detection:

```
find_package(osgWidget)
```

OpenSceneGraph and osgWidget headers are intended to be included in C++ project source code as:

example.cxx

```
#include <osg/PositionAttitudeTransform>
#include <osgWidget/Widget>
// ...
```

When working with the OpenSceneGraph toolkit, other libraries such as OpenGL may also be required.

### Result Variables
This module defines the following variables:

osgWidget_FOUND

Added in version 3.3.

Boolean indicating whether the osgWidget NodeKit of the OpenSceneGraph toolkit was found.

OSGWIDGET_LIBRARIES

The libraries needed to link against to use osgWidget.

OSGWIDGET_LIBRARY

A result variable that is set to the same value as the OSGWIDGET_LIBRARIES variable.

### Cache Variables
The following cache variables may also be set:

OSGWIDGET_INCLUDE_DIR

The include directory containing headers needed to use osgWidget.

OSGWIDGET_LIBRARY_DEBUG

The path to the osgWidget debug library.

### Hints
This module accepts the following variables:

OSGDIR

Environment variable that can be set to help locate the OpenSceneGraph toolkit, including its osgWidget NodeKit, when installed in a custom location. It should point to the OpenSceneGraph installation prefix used when it was configured, built, and installed: ./configure --prefix=$OSGDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

OSGWIDGET_FOUND

Deprecated since version 4.2: Use osgWidget_FOUND, which has the same value.

Boolean indicating whether the osgWidget NodeKit of the OpenSceneGraph toolkit was found.

### Examples
Finding osgWidget explicitly with this module and creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking it to a project target:

```
find_package(osgWidget)
if(osgWidget_FOUND AND NOT TARGET osgWidget::osgWidget)

  add_library(osgWidget::osgWidget INTERFACE IMPORTED)

  set_target_properties(

    osgWidget::osgWidget

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${OSGWIDGET_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${OSGWIDGET_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE osgWidget::osgWidget)
```

### See Also
•

The FindOpenSceneGraph <#module:FindOpenSceneGraph> module to find OpenSceneGraph toolkit.

### FindPatch
Added in version 3.10.

Finds the patch command-line executable for applying diff patches to original files:

```
find_package(Patch [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Patch::patch

Target encapsulating the patch command-line executable, available only if patch is found. Changed in version 4.0: This imported target is defined only when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT.

### Result Variables
This module defines the following variables:

Patch_FOUND

Boolean indicating whether the patch command-line executable was found.

### Cache Variables
The following cache variables may also be set:

Patch_EXECUTABLE

The path to the patch command-line executable.

### Examples
Finding patch command and executing it in a process:

```
find_package(Patch)
if(Patch_FOUND)

  execute_process(

    COMMAND ${Patch_EXECUTABLE} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/src.patch

  )
endif()
```

The imported target can be used, for example, inside the add_custom_command() <#command:add_custom_command> command, which patches the given file when some build rule depends on its output:

```
find_package(Patch)
if(TARGET Patch::patch)

  # Executed when some build rule depends on the src.c file.

  add_custom_command(

    OUTPUT src.c

    COMMAND Patch::patch -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/src.patch

    # ...

  )
endif()
```

### FindPerl
Finds a Perl interpreter:

```
find_package(Perl [<version>] [...])
```

Perl is a general-purpose, interpreted, dynamic programming language.

### Result Variables
This module defines the following variables:

Perl_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Perl executable was found.

Perl_VERSION

Added in version 4.2.

The version of Perl found.

### Cache Variables
The following cache variables may also be set:

PERL_EXECUTABLE

Full path to the perl executable.

### Deprecated Variables
The following variables are provided for backward compatibility:

PERL_FOUND

Deprecated since version 4.2: Use Perl_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Perl executable was found.

PERL_VERSION_STRING

Deprecated since version 4.2: Superseded by the Perl_VERSION.

The version of Perl found.

### Examples
Finding the Perl interpreter and executing it in a process:

```
find_package(Perl)
if(Perl_FOUND)

  execute_process(COMMAND ${PERL_EXECUTABLE} --help)
endif()
```

### See Also
•

The FindPerlLibs <#module:FindPerlLibs> to find Perl libraries.

### FindPerlLibs
Finds Perl libraries:

```
find_package(PerlLibs [<version>] [...])
```

Perl is a general-purpose, interpreted, dynamic programming language.

This module detects whether Perl interpreter is installed via the FindPerl <#module:FindPerl> module and determines the locations of Perl include paths, libraries, and the library name.

### Result Variables
This module defines the following variables:

PerlLibs_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) <perl.h> and libperl were found.

PerlLibs_VERSION

Added in version 4.2.

The version of Perl library found.

PERL_SITESEARCH

Path to the sitesearch install directory (-V:installsitesearch).

PERL_SITEARCH

Path to the sitelib install directory (-V:installsitearch).

PERL_SITELIB

Path to the sitelib install directory (-V:installsitelib).

PERL_VENDORARCH

Path to the vendor arch install directory (-V:installvendorarch).

PERL_VENDORLIB

Path to the vendor lib install directory (-V:installvendorlib).

PERL_ARCHLIB

Path to the core arch lib install directory (-V:archlib).

PERL_PRIVLIB

Path to the core priv lib install directory (-V:privlib).

PERL_UPDATE_ARCHLIB

Path to the update arch lib install directory (-V:installarchlib).

PERL_UPDATE_PRIVLIB

Path to the update priv lib install directory (-V:installprivlib).

PERL_EXTRA_C_FLAGS

Compilation flags used to build Perl.

### Cache Variables
The following cache variables may also be set:

PERL_INCLUDE_PATH

Directory containing perl.h and other Perl header files.

PERL_LIBRARY

Path to the libperl.

PERL_EXECUTABLE

Full path to the perl executable.

### Deprecated Variables
The following variables are provided for backward compatibility:

PERLLIBS_FOUND

Deprecated since version 4.2: Use PerlLibs_FOUND, which has the same value.

Boolean indicating whether (the requested version of) <perl.h> and libperl were found.

### Examples
Finding Perl libraries and specifying the minimum required version:

```
find_package(PerlLibs 6.0)
```

### See Also
•

The FindPerl <#module:FindPerl> module to find the Perl interpreter.

### FindPHP4
Finds PHP version 4, a general-purpose scripting language:

```
find_package(PHP4 [...])
```

Note:

This module is specifically for PHP version 4, which is obsolete and no longer supported. For modern development, use a newer PHP version.

This module checks if PHP 4 is installed and determines the locations of the include directories and the PHP command-line interpreter.

### Result Variables
This module defines the following variables:

PHP4_FOUND

Boolean indicating whether PHP 4 was found.

### Cache Variables
The following cache variables may also be set:

PHP4_INCLUDE_PATH

The directory containing php.h and other headers needed to use PHP.

PHP4_EXECUTABLE

The full path to the php command-line interpreter executable.

### Examples
Finding PHP:

```
find_package(PHP4)
```

### FindPhysFS
Finds the PhysicsFS library (PhysFS) for file I/O abstraction:

```
find_package(PhysFS [...])
```

### Result Variables
This module defines the following variables:

PhysFS_FOUND

Added in version 3.3.

Boolean indicating whether the PhysicsFS library was found.

### Cache Variables
The following cache variables may also be set:

PHYSFS_INCLUDE_DIR

Directory containing the <physfs.h> and related headers needed for using the library.

PHYSFS_LIBRARY

Path to the PhysicsFS library needed to link against.

### Hints
This module accepts the following variables:

PHYSFSDIR

Environment variable that can be set to help locate a PhysicsFS library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing PhysicsFS library: ./configure --prefix=$PHYSFSDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

PHYSFS_FOUND

Deprecated since version 4.2: Use the PhysFS_FOUND, which has the same value.

Boolean indicating whether the PhysicsFS library was found.

### Examples
Finding the PhysicsFS library:

```
find_package(PhysFS)
```

### FindPike
Finds the Pike compiler and interpreter:

```
find_package(Pike [...])
```

Pike is interpreted, general purpose, high-level, dynamic programming language.

### Result Variables
This module defines the following variables:

Pike_FOUND

Added in version 4.2.

Boolean indicating whether Pike was found.

### Cache Variables
The following cache variables may also be set:

PIKE_INCLUDE_PATH

The directory containing program.h.

PIKE_EXECUTABLE

Full path to the pike binary.

### Examples
Finding Pike:

```
find_package(Pike)
```

### FindPkgConfig
A pkg-config module for CMake.

Finds the pkg-config executable and provides commands to use it in CMake:

```
find_package(PkgConfig [<version>] [QUIET] [REQUIRED] [...])
```

pkg-config is a command-line program for configuring build dependency information. Initially developed by FreeDesktop, it is also available in several implementations, such as pkgconf, u-config, and similar. It reads package data from the so-called PC metadata files (<module-name>.pc) that may come installed with packages. This module is a wrapper around the pkg-config command-line executable.

### Result Variables
This module defines the following variables:

PkgConfig_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) pkg-config executable was found.

PkgConfig_VERSION

Added in version 4.2.

The version of pkg-config that was found.

PKG_CONFIG_EXECUTABLE

The pathname of the pkg-config program.

PKG_CONFIG_ARGN

Added in version 3.22.

A list of arguments to pass to pkg-config.

Both PKG_CONFIG_EXECUTABLE and PKG_CONFIG_ARGN are initialized by the module, but may be overridden by the user. See Hints for how these variables are initialized.

### Commands
This module provides the following commands, if pkg-config is found:

- pkg_check_modules()

- pkg_search_module()

- pkg_get_variable()

pkg_check_modules

Checks for all the given modules, setting a variety of result variables in the calling scope:

```
pkg_check_modules(

  <prefix>

  [QUIET]

  [REQUIRED]

  [NO_CMAKE_PATH]

  [NO_CMAKE_ENVIRONMENT_PATH]

  [IMPORTED_TARGET [GLOBAL]]

  <module-spec> [<module-spec>...]
)
```

The arguments are:

<prefix>

Prefix string prepended to result variables for the specified modules.

QUIET

When this argument is given, no status messages will be printed.

REQUIRED

When this argument is given, the command will fail with an error if any of the specified module(s) could not be found.

NO_CMAKE_PATH, NO_CMAKE_ENVIRONMENT_PATH

Added in version 3.3.

The CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH>, CMAKE_FRAMEWORK_PATH <#variable:CMAKE_FRAMEWORK_PATH>, and CMAKE_APPBUNDLE_PATH <#variable:CMAKE_APPBUNDLE_PATH> cache and environment variables will be added to the pkg-config search path. The NO_CMAKE_PATH and NO_CMAKE_ENVIRONMENT_PATH arguments disable this behavior for the cache variables and environment variables respectively. The PKG_CONFIG_USE_CMAKE_PREFIX_PATH variable set to FALSE disables this behavior globally.

IMPORTED_TARGET [GLOBAL]

Added in version 3.7.

This argument will create an imported target <#imported-targets> named PkgConfig::<prefix> that can be passed directly as an argument to target_link_libraries() <#command:target_link_libraries>. It will encapsulate usage requirements for all specified modules <module-spec>... at once.

GLOBAL

Added in version 3.13.

This argument is used together with IMPORTED_TARGET and will make the imported target available in global scope.

Added in version 3.15: Non-library linker options reported by pkg-config are stored in the INTERFACE_LINK_OPTIONS <#prop_tgt:INTERFACE_LINK_OPTIONS> target property.

Changed in version 3.18: Include directories specified with -isystem are stored in the INTERFACE_INCLUDE_DIRECTORIES <#prop_tgt:INTERFACE_INCLUDE_DIRECTORIES> target property. Previous versions of CMake left them in the INTERFACE_COMPILE_OPTIONS <#prop_tgt:INTERFACE_COMPILE_OPTIONS> property.

<module-spec>

Each <module-spec> can be either a bare module name (as defined in its PC metadata file name <module-name>.pc) or it can be a module name with a version constraint (operators =, <, >, <= and >= are supported). The following are examples for a module named foo with various constraints:

- foo matches any version.

- foo<2 only matches versions before 2.

- foo>=3.1 matches any version from 3.1 or later.

- foo=1.2.3 requires that foo must be exactly version 1.2.3.

Result Variables

The following variables may be set upon return. Two sets of values exist: One for the common case (<XXX> = <prefix>) and another for the information pkg-config provides when called with the --static option (<XXX> = <prefix>_STATIC).

<XXX>_FOUND

Boolean variable set to 1 if module(s) exist.

<XXX>_LIBRARIES

A list of only the libraries (without the -l).

<XXX>_LINK_LIBRARIES

The libraries and their absolute paths.

<XXX>_LIBRARY_DIRS

The paths of the libraries (without the -L).

<XXX>_LDFLAGS

All required linker flags.

<XXX>_LDFLAGS_OTHER

All other linker flags.

<XXX>_INCLUDE_DIRS

The -I preprocessor flags (without the -I).

<XXX>_CFLAGS

All required cflags.

<XXX>_CFLAGS_OTHER

The other compiler flags.

All but <XXX>_FOUND may be a semicolon-separated list <#cmake-language-lists> if the associated variable returned from pkg-config has multiple values.

Changed in version 3.18: Include directories specified with -isystem are stored in the <XXX>_INCLUDE_DIRS variable. Previous versions of CMake left them in <XXX>_CFLAGS_OTHER.

There are some special variables whose prefix depends on the number of <module-spec> given. When there is only one <module-spec>, <YYY> will simply be <prefix>, but if two or more <module-spec> items are given, <YYY> will be <prefix>_<module-name>.

<YYY>_VERSION

The version of the module.

<YYY>_PREFIX

The prefix directory of the module.

<YYY>_INCLUDEDIR

The include directory of the module.

<YYY>_LIBDIR

The lib directory of the module.

Changed in version 3.8: For any given <prefix>, pkg_check_modules() can be called multiple times with different parameters. Previous versions of CMake cached and returned the first successful result.

Changed in version 3.16: If a full path to the found library can't be determined, but it's still visible to the linker, pass it through as -l<name>. Previous versions of CMake failed in this case.

pkg_search_module

Searches for the first successful match from one or more provided module specifications:

```
pkg_search_module(

  <prefix>

  [QUIET]

  [REQUIRED]

  [NO_CMAKE_PATH]

  [NO_CMAKE_ENVIRONMENT_PATH]

  [IMPORTED_TARGET [GLOBAL]]

  <module-spec> [<module-spec>...]
)
```

The behavior and arguments of this command are the same as pkg_check_modules(), except that rather than checking for all the specified modules, it searches for just the first successful match.

This command can be used, for example, when some package is known to have possible multiple <module-spec> on different platforms or versions for the same package.

Result Variables

This command defines the same variables as described above with addition to:

<prefix>_MODULE_NAME

Added in version 3.16.

If a module is found, the <prefix>_MODULE_NAME variable will contain the name of the matching module. This variable can be used if the pkg_get_variable() command needs to be called with the <module-name> argument that was found by the pkg_search_module().

pkg_get_variable

Added in version 3.4.

Retrieves the value of a pkg-config variable and stores it in the result variable in the calling scope:

```
pkg_get_variable(

  <result-var>

  <module-name>

  <var-name>

  [DEFINE_VARIABLES <key>=<value>...]
)
```

The arguments are:

<result-var>

Name of the result variable that will contain the value of pkg-config variable. If pkg-config returns multiple values for the specified variable <var-name>, <result-var> will contain a semicolon-separated list <#cmake-language-lists>.

<module-name>

Name of the module as defined in its PC metadata file name (<module-name>.pc).

<var-name>

The pkg-config variable name from the PC metadata file <module-name>.pc.

DEFINE_VARIABLES <key>=<value>...

Added in version 3.28.

Specify key-value pairs to redefine variables affecting the variable retrieved with pkg-config.

### Hints
This module accepts the following variables before calling find_package(PkgConfig) to influence this module's behavior:

ENV{PKG_CONFIG_PATH}

Environment variable that specifies additional paths in which pkg-config will search for its .pc files. The pkg-config tool by default uses this variable, while CMake also provides more common CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH> variable to specify additional paths where to look for packages and their .pc files.

ENV{PKG_CONFIG}

Added in version 3.1.

Environment variable that can be set to the path of the pkg-config executable and can be used to initialize the PKG_CONFIG_EXECUTABLE variable, if it has not yet been set.

PKG_CONFIG_EXECUTABLE

This cache variable can be set to the path of the pkg-config executable. find_program() <#command:find_program> is called internally by the module with this variable. Changed in version 3.22: If the PKG_CONFIG environment variable is set, only the first argument is taken from it when using it as a hint.

PKG_CONFIG_ARGN

Added in version 3.22.

This cache variable can be set to a list of arguments to additionally pass to pkg-config if needed. If not provided, it will be initialized from the PKG_CONFIG environment variable, if set. The first argument in that environment variable is assumed to be the pkg-config program, while all remaining arguments after that are used to initialize PKG_CONFIG_ARGN. If no such environment variable is defined, PKG_CONFIG_ARGN is initialized to an empty string. The module does not update the variable once it has been set in the cache.

PKG_CONFIG_USE_CMAKE_PREFIX_PATH

Added in version 3.1.

Specifies whether pkg_check_modules() and pkg_search_module() should add the paths in the CMAKE_PREFIX_PATH <#variable:CMAKE_PREFIX_PATH>, CMAKE_FRAMEWORK_PATH <#variable:CMAKE_FRAMEWORK_PATH> and CMAKE_APPBUNDLE_PATH <#variable:CMAKE_APPBUNDLE_PATH> cache and environment variables to the pkg-config search path.

If this variable is not set, this behavior is enabled by default if CMAKE_MINIMUM_REQUIRED_VERSION <#variable:CMAKE_MINIMUM_REQUIRED_VERSION> is 3.1 or later, disabled otherwise.

### Deprecated Variables
The following variables are provided for backward compatibility:

PKG_CONFIG_FOUND

Deprecated since version 4.2: Use PkgConfig_FOUND, which has the same value.

Boolean indicating whether the (requested version of) pkg-config executable was found.

PKG_CONFIG_VERSION_STRING

Deprecated since version 4.2: Use PkgConfig_VERSION, which has the same value.

The version of pkg-config that was found.

### Examples: Finding pkg-config
Finding pkg-config:

```
find_package(PkgConfig)
```

Finding pkg-config and making it required (if not found, processing stops with an error message):

```
find_package(PkgConfig REQUIRED)
```

Finding pkg-config quietly without printing status message as commonly used in find modules:

```
find_package(PkgConfig QUIET)
```

### Examples: Using pkg_check_modules()
Checking for any version of glib2. If found, the output variable GLIB2_VERSION will hold the actual version found:

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_check_modules(GLIB2 glib-2.0)
endif()
```

The following example looks for at least version 2.10 of glib2. If found, the output variable GLIB2_VERSION will hold the actual version found:

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_check_modules(GLIB2 glib-2.0>=2.10)
endif()
```

The following example looks for both glib2-2.0 (at least version 2.10) and any version of gtk2+-2.0. Only if both are found will FOO be considered found. The FOO_glib-2.0_VERSION and FOO_gtk+-2.0_VERSION variables will be set to their respective found module versions.

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_check_modules(FOO glib-2.0>=2.10 gtk+-2.0)
endif()
```

The following example requires any version of xrender:

```
find_package(PkgConfig QUIET REQUIRED)
pkg_check_modules(XRENDER REQUIRED xrender)
```

Example output variables set by a successful call:

```
XRENDER_LIBRARIES=Xrender;X11
XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
```

### Example: Using pkg_search_module()
Searching for LibXml2 package, which might be provided with different module specifications (libxml-2.0 or libxml2):

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_search_module(BAR libxml-2.0 libxml2 libxml>=2)
endif()
```

### Example: Creating Imported Target
In the following example an imported target is created from the module specifications to use in the project directly without using a find module. These imported targets can be used, for example, in cases, where package is known to support pkg-config on all supported platforms:

```
find_package(PkgConfig QUIET REQUIRED)
pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk4>=4.14)
target_link_libraries(example PRIVATE PkgConfig::GTK)
```

### Example: Using pkg_get_variable()
Retrieving the value of pkg-config variable girdir from the package Gobject:

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)
endif()
message(STATUS "${GI_GIRDIR}")
```

### See Also

- The cmake_pkg_config() <#command:cmake_pkg_config> command for a modern and more advanced way to work with pkg-config in CMake without requiring pkg-config executable to be installed.

- Find Modules <#find-modules> for details how to write a find module.

### FindPNG
Finds libpng, the official reference library for the PNG image format:

```
find_package(PNG [<version>] [...])
```

Note:

The PNG library depends on the ZLib compression library, which must be found for this module to succeed.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

PNG::PNG

Added in version 3.5.

Target encapsulating the libpng library usage requirements, available if libpng is found.

### Result Variables
This module defines the following variables:

PNG_FOUND

Boolean indicating whether the (requested version of) PNG library was found.

PNG_VERSION

Added in version 4.2.

The version of the PNG library found.

PNG_INCLUDE_DIRS

Directory containing the PNG headers (e.g., png.h).

PNG_LIBRARIES

PNG libraries required for linking.

PNG_DEFINITIONS

Compile definitions for using PNG, if any. They can be added with target_compile_definitions() <#command:target_compile_definitions> command when not using the PNG::PNG imported target.

### Deprecated Variables
The following variables may also be set for backward compatibility:

PNG_LIBRARY

Deprecated since version 3.0: Use the PNG::PNG imported target.

Path to the PNG library.

PNG_INCLUDE_DIR

Deprecated since version 3.0: Use the PNG::PNG imported target.

Directory containing the PNG headers (same as PNG_INCLUDE_DIRS).

PNG_VERSION_STRING

Deprecated since version 4.2: Superseded by the PNG_VERSION.

The version of the PNG library found.

### Examples
Finding PNG library and using it in a project:

```
find_package(PNG)
target_link_libraries(project_target PRIVATE PNG::PNG)
```

### FindPostgreSQL
Finds the PostgreSQL installation - the client library (libpq) and optionally the server:

```
find_package(PostgreSQL [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

PostgreSQL::PostgreSQL

Added in version 3.14.

Target encapsulating all usage requirements of the required libpq client library and the optionally requested PostgreSQL server component. This target is available only if PostgreSQL is found.

### Result Variables
This module defines the following variables:

PostgreSQL_FOUND

Boolean indicating whether the minimum required version and components of PostgreSQL were found.

PostgreSQL_VERSION

Added in version 4.2.

The version of PostgreSQL found.

PostgreSQL_LIBRARIES

The PostgreSQL libraries needed for linking.

PostgreSQL_INCLUDE_DIRS

The include directories containing PostgreSQL headers.

PostgreSQL_LIBRARY_DIRS

The directories containing PostgreSQL libraries.

PostgreSQL_TYPE_INCLUDE_DIR

The include directory containing PostgreSQL server headers.

### Components
This module supports the following additional components:

Server

Added in version 3.20.

Ensures that server headers are also found. Note that PostgreSQL_TYPE_INCLUDE_DIR variable is set regardless of whether this component is specified in the find_package() call.

### Deprecated Variables
The following variables are provided for backward compatibility:

PostgreSQL_VERSION_STRING

Deprecated since version 4.2: Superseded by the PostgreSQL_VERSION.

The version of PostgreSQL found.

### Examples
Finding the PostgreSQL client library and linking it to a project target:

```
find_package(PostgreSQL)
target_link_libraries(project_target PRIVATE PostgreSQL::PostgreSQL)
```

Specifying a minimum required PostgreSQL version:

```
find_package(PostgreSQL 11)
```

Finding the PostgreSQL client library and requiring server headers using the Server component provides an imported target with all usage requirements, which can then be linked to a project target:

```
find_package(PostgreSQL COMPONENTS Server)
target_link_libraries(project_target PRIVATE PostgreSQL::PostgreSQL)
```

When checking for PostgreSQL client library features, some capabilities are indicated by preprocessor macros in the libpq-fe.h header (e.g. LIBPQ_HAS_PIPELINING). Others may require using the check_symbol_exists() <#command:check_symbol_exists> command:

```
find_package(PostgreSQL)
target_link_libraries(project_target PRIVATE PostgreSQL::PostgreSQL)
# The PQservice() function is available as of PostgreSQL 18.
if(TARGET PostgreSQL::PostgreSQL)

  include(CheckSymbolExists)

  include(CMakePushCheckState)

  cmake_push_check_state(RESET)

  set(CMAKE_REQUIRED_LIBRARIES PostgreSQL::PostgreSQL)

  check_symbol_exists(PQservice "libpq-fe.h" PROJECT_HAS_PQSERVICE)

  cmake_pop_check_state()
endif()
```

### FindProducer
Note:

Producer (also known as Open Producer) library originated from the osgProducer utility library in early versions of the OpenSceneGraph toolkit and was later developed into a standalone library. The osgProducer was eventually replaced by the osgViewer library, and the standalone Producer library became obsolete and is no longer maintained. For details about OpenSceneGraph usage, refer to the FindOpenSceneGraph <#module:FindOpenSceneGraph> module.

Finds the Producer library, a windowing and event handling library designed primarily for real-time graphics applications:

```
find_package(Producer [...])
```

Producer library headers are intended to be included in C++ project source code as:

example.cxx

```
#include <Producer/CameraGroup>
```

### Result Variables
This module defines the following variables:

Producer_FOUND

Added in version 3.3.

Boolean indicating whether Producer was found.

### Cache Variables
The following cache variables may also be set:

PRODUCER_INCLUDE_DIR

The include directory containing headers needed to use Producer.

PRODUCER_LIBRARY

The path to the Producer library needed to link against for usage.

### Hints
This module accepts the following variables:

PRODUCER_DIR

Environment variable that can be set to help locate a custom installation of the Producer library. It should point to the root directory where the Producer library was installed. This should match the installation prefix used when configuring and building Producer, such as with ./configure --prefix=$PRODUCER_DIR.

Because Producer was historically tightly integrated with OpenSceneGraph, this module also accepts the following environment variables as equivalents to PRODUCER_DIR for convenience to specify common installation root for multiple OpenSceneGraph-related libraries at once:

OSGDIR

Environment variable treated the same as PRODUCER_DIR.

OSG_DIR

Environment variable treated the same as PRODUCER_DIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

PRODUCER_FOUND

Deprecated since version 4.2: Use Producer_FOUND, which has the same value.

Boolean indicating whether Producer was found.

### Examples
Finding the Producer library and creating an imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(Producer)
if(Producer_FOUND AND NOT TARGET Producer::Producer)

  add_library(Producer::Producer INTERFACE IMPORTED)

  set_target_properties(

    Producer::Producer

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${PRODUCER_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${PRODUCER_LIBRARY}"

  )
endif()
target_link_libraries(example PRIVATE Producer::Producer)
```

### FindProtobuf
Note:

If the Protobuf library is built and installed using its CMake-based build system, it provides a package configuration file <#config-file-packages> for use with the find_package() <#command:find_package> command in config mode:

```
find_package(Protobuf CONFIG)
```

In this case, imported targets and CMake commands such as protobuf_generate() are provided by the upstream package rather than this module. Additionally, some variables documented here are not available in config mode, as imported targets are preferred. For usage details, refer to the upstream documentation, which is the recommended way to use Protobuf with CMake.

This module works only in module mode.

This module finds the Protocol Buffers library (Protobuf) in module mode:

```
find_package(Protobuf [<version>] [...])
```

Protobuf is an open-source, language-neutral, and platform-neutral mechanism for serializing structured data, developed by Google. It is commonly used for data exchange between programs or across networks.

Added in version 3.6: Support for the <version> argument in find_package(Protobuf <version>) <#command:find_package>.

Changed in version 3.6: All input and output variables use the Protobuf_ prefix. Variables with PROTOBUF_ prefix are supported for backward compatibility.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

protobuf::libprotobuf

Added in version 3.9.

Target encapsulating the Protobuf library usage requirements, available if Protobuf library is found.

protobuf::libprotobuf-lite

Added in version 3.9.

Target encapsulating the protobuf-lite library usage requirements, available if Protobuf and its lite library are found.

protobuf::libprotoc

Added in version 3.9.

Target encapsulating the protoc library usage requirements, available if Protobuf and its protoc library are found.

protobuf::protoc

Added in version 3.10.

Imported executable target encapsulating the protoc compiler usage requirements, available if Protobuf and protoc are found.

### Result Variables
This module defines the following variables:

Protobuf_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Protobuf library was found.

Protobuf_VERSION

Added in version 3.6.

The version of Protobuf found.

Protobuf_INCLUDE_DIRS

Include directories needed to use Protobuf.

Protobuf_LIBRARIES

Libraries needed to link against to use Protobuf.

Protobuf_PROTOC_LIBRARIES

Libraries needed to link against to use the protoc library.

Protobuf_LITE_LIBRARIES

Libraries needed to link against to use the protobuf-lite library.

### Cache Variables
The following cache variables may also be set:

Protobuf_INCLUDE_DIR

The include directory containing Protobuf headers.

Protobuf_LIBRARY

The path to the protobuf library.

Protobuf_PROTOC_LIBRARY

The path to the protoc library.

Protobuf_PROTOC_EXECUTABLE

The path to the protoc compiler.

Protobuf_LIBRARY_DEBUG

The path to the protobuf debug library.

Protobuf_PROTOC_LIBRARY_DEBUG

The path to the protoc debug library.

Protobuf_LITE_LIBRARY

The path to the protobuf-lite library.

Protobuf_LITE_LIBRARY_DEBUG

The path to the protobuf-lite debug library.

Protobuf_SRC_ROOT_FOLDER

When compiling with MSVC, if this cache variable is set, the protobuf-default Visual Studio project build locations will be searched for libraries and binaries:

- <Protobuf_SRC_ROOT_FOLDER>/vsprojects/{Debug,Release}, or

- <Protobuf_SRC_ROOT_FOLDER>/vsprojects/x64/{Debug,Release}

### Hints
This module accepts the following optional variables before calling the find_package(Protobuf):

Protobuf_DEBUG

Added in version 3.6.

Boolean variable that enables debug messages of this module to be printed for debugging purposes.

Protobuf_USE_STATIC_LIBS

Added in version 3.9.

Set to ON to force the use of the static libraries. Default is OFF.

### Commands
This module provides the following commands if Protobuf is found:

### Generating Source Files
protobuf_generate

Added in version 3.13.

Automatically generates source files from .proto schema files at build time:

```
protobuf_generate(

  [TARGET <target>]

  [LANGUAGE <lang>]

  [OUT_VAR <variable>]

  [EXPORT_MACRO <macro>]

  [PROTOC_OUT_DIR <out-dir>]

  [PLUGIN <plugin>]

  [PLUGIN_OPTIONS <plugin-options>]

  [DEPENDENCIES <dependencies>...]

  [PROTOS <proto-files>...]

  [IMPORT_DIRS <dirs>...]

  [APPEND_PATH]

  [GENERATE_EXTENSIONS <extensions>...]

  [PROTOC_OPTIONS <options>...]

  [PROTOC_EXE <executable>]

  [DESCRIPTORS]
)
```

TARGET <target>

The CMake target to which the generated files are added as sources. This option is required when OUT_VAR <variable> is not used.

LANGUAGE <lang>

A single value: cpp or python. Determines the kind of source files to generate. Defaults to cpp. For other languages, use the GENERATE_EXTENSIONS option.

OUT_VAR <variable>

The name of a CMake variable that will be populated with the paths to the generated source files.

EXPORT_MACRO <macro>

The name of a preprocessor macro applied to all generated Protobuf message classes and extern variables. This can be used, for example, to declare DLL exports. The macro should expand to __declspec(dllexport) or __declspec(dllimport), depending on what is being compiled. This option is only used when LANGUAGE is cpp.

PROTOC_OUT_DIR <out-dir>

The output directory for generated source files. Defaults to: CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>.

PLUGIN <plugin>

Added in version 3.21.

An optional plugin executable. This could be, for example, the path to grpc_cpp_plugin.

PLUGIN_OPTIONS <plugin-options>

Added in version 3.28.

Additional options passed to the plugin, such as generate_mock_code=true for the gRPC C++ plugin.

DEPENDENCIES <dependencies>...

Added in version 3.28.

Dependencies on which the generation of files depends on. These are forwarded to the underlying add_custom_command(DEPENDS) <#command:add_custom_command> invocation.

Changed in version 4.1: This argument now accepts multiple values (DEPENDENCIES a b c...). Previously, only a single value could be specified (DEPENDENCIES "a;b;c;...").

PROTOS <proto-files>...

A list of .proto schema files to process. If <target> is also specified, these will be combined with all .proto source files from that target.

IMPORT_DIRS <dirs>...

A list of one or more common parent directories for the schema files. For example, if the schema file is proto/helloworld/helloworld.proto and the import directory is proto/, then the generated files will be <out-dir>/helloworld/helloworld.pb.h and <out-dir>/helloworld/helloworld.pb.cc.

APPEND_PATH

If specified, the base paths of all proto schema files are appended to IMPORT_DIRS (it causes protoc to be invoked with -I argument for each directory containing a .proto file).

GENERATE_EXTENSIONS <extensions>...

If LANGUAGE is omitted, this must be set to specify the extensions generated by protoc.

PROTOC_OPTIONS <options>...

Added in version 3.28.

A list of additional command-line options passed directly to the protoc compiler.

PROTOC_EXE <executable>

Added in version 4.0.

The command-line program, path, or CMake executable used to generate Protobuf bindings. If omitted, protobuf::protoc imported target is used by default.

DESCRIPTORS

If specified, a command-line option --descriptor_set_out=<proto-file> is appended to protoc compiler for each .proto source file, enabling the creation of self-describing messages. This option can only be used when <lang> is cpp and Protobuf is found in module mode. Note:

This option is not available when Protobuf is found in config mode.

### Deprecated Commands
The following commands are provided for backward compatibility.

Note:

The protobuf_generate_cpp() and protobuf_generate_python() commands work correctly only within the same directory scope, where find_package(Protobuf ...) is called.

Note:

If Protobuf is found in config mode, the protobuf_generate_cpp() and protobuf_generate_python() commands are not available as of Protobuf version 3.0.0, unless the upstream package configuration hint variable protobuf_MODULE_COMPATIBLE is set to boolean true before calling find_package(Protobuf ...).

protobuf_generate_cpp

Deprecated since version 4.1: Use protobuf_generate().

Automatically generates C++ source files from .proto schema files at build time:

```
protobuf_generate_cpp(

  <sources-variable>

  <headers-variable>

  [DESCRIPTORS <variable>]

  [EXPORT_MACRO <macro>]

  <proto-files>...
)
```

<sources-variable>

Name of the variable to define, which will contain a list of generated C++ source files.

<headers-variable>

Name of the variable to define, which will contain a list of generated header files.

DESCRIPTORS <variable>

Added in version 3.10.

Name of the variable to define, which will contain a list of generated descriptor files if requested.

Note:

This option is not available when Protobuf is found in config mode.

EXPORT_MACRO <macro>

Name of a macro that should expand to __declspec(dllexport) or __declspec(dllimport), depending on what is being compiled.

<proto-files>...

One of more .proto files to be processed.

protobuf_generate_python

Deprecated since version 4.1: Use protobuf_generate().

Added in version 3.4.

Automatically generates Python source files from .proto schema files at build time:

```
protobuf_generate_python(<python-sources-variable> <proto-files>...)
```

<python-sources-variable>

Name of the variable to define, which will contain a list of generated Python source files.

<proto-files>...

One or more .proto files to be processed.

----

The protobuf_generate_cpp() and protobuf_generate_python() commands accept the following optional variables before being invoked:

Protobuf_IMPORT_DIRS

Deprecated since version 4.1.

A list of additional directories to search for imported .proto files.

PROTOBUF_GENERATE_CPP_APPEND_PATH

Deprecated since version 4.1: Use protobuf_generate(APPEND_PATH) command option.

A boolean variable that, if set to boolean true, causes protoc to be invoked with -I argument for each directory containing a .proto file. By default, it is set to boolean true.

### Examples: Finding Protobuf
Finding Protobuf library:

```
find_package(Protobuf)
```

Or, finding Protobuf and specifying a minimum required version:

```
find_package(Protobuf 30)
```

Or, finding Protobuf and making it required (if not found, processing stops with an error message):

```
find_package(Protobuf REQUIRED)
```

### Example: Finding Protobuf in Config Mode
When Protobuf library is built and installed using its CMake-based build system, it can be found in config mode:

```
find_package(Protobuf CONFIG)
```

However, some Protobuf installations might still not provide package configuration file. The following example shows, how to use the CMAKE_FIND_PACKAGE_PREFER_CONFIG <#variable:CMAKE_FIND_PACKAGE_PREFER_CONFIG> variable to find Protobuf in config mode and falling back to module mode if config file is not found:

```
set(CMAKE_FIND_PACKAGE_PREFER_CONFIG TRUE)
find_package(Protobuf)
unset(CMAKE_FIND_PACKAGE_PREFER_CONFIG)
```

### Example: Using Protobuf
Finding Protobuf and linking its imported library target to a project target:

```
find_package(Protobuf)
target_link_libraries(example PRIVATE protobuf::libprotobuf)
```

### Example: Processing Proto Schema Files
The following example demonstrates how to process all *.proto schema source files added to a target into C++ source files:

CMakeLists.txt

```
cmake_minimum_required(VERSION 3.24)
project(ProtobufExample)
add_executable(example main.cxx person.proto)
find_package(Protobuf)
if(Protobuf_FOUND)

  protobuf_generate(TARGET example)
endif()
target_link_libraries(example PRIVATE protobuf::libprotobuf)
target_include_directories(example PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
```

person.proto

```
syntax = "proto3";
message Person {

  string name = 1;

  int32 id = 2;
}
```

main.cxx

```
#include <iostream>
#include "person.pb.h"
int main()
{

  Person person;

  person.set_name("Alice");

  person.set_id(123);

  std::cout << "Name: " << person.name() << "\n";

  std::cout << "ID: " << person.id() << "\n";

  return 0;
}
```

### Example: Using Protobuf and gRPC
The following example shows how to use Protobuf and gRPC:

CMakeLists.txt

```
find_package(Protobuf REQUIRED)
find_package(gRPC CONFIG REQUIRED)
add_library(ProtoExample Example.proto)
target_link_libraries(ProtoExample PUBLIC gRPC::grpc++)
protobuf_generate(TARGET ProtoExample)
protobuf_generate(

  TARGET ProtoExample

  LANGUAGE grpc

  PLUGIN protoc-gen-grpc=$<TARGET_FILE:gRPC::grpc_cpp_plugin>

  PLUGIN_OPTIONS generate_mock_code=true

  GENERATE_EXTENSIONS .grpc.pb.h .grpc.pb.cc
)
```

### Examples: Upgrading Deprecated Commands
The following example shows how to process .proto files to C++ code, using a deprecated command and its modern replacement:

CMakeLists.txt with deprecated command

```
find_package(Protobuf)
if(Protobuf_FOUND)

  protobuf_generate_cpp(

    proto_sources

    proto_headers

    EXPORT_MACRO DLL_EXPORT

    DESCRIPTORS proto_descriptors

    src/protocol/Proto1.proto

    src/protocol/Proto2.proto

  )
endif()
target_sources(

  example

  PRIVATE ${proto_sources} ${proto_headers} ${proto_descriptors}
)
target_link_libraries(example PRIVATE protobuf::libprotobuf)
```

CMakeLists.txt with upgraded code

```
find_package(Protobuf)
if(Protobuf_FOUND)

  protobuf_generate(

    TARGET example

    EXPORT_MACRO DLL_EXPORT

    IMPORT_DIRS src/protocol

    DESCRIPTORS

    PROTOS

      src/protocol/Proto1.proto

      src/protocol/Proto2.proto

  )
endif()
target_link_libraries(example PRIVATE protobuf::libprotobuf)
```

The following example shows how to process .proto files to Python code, using a deprecated command and its modern replacement:

CMakeLists.txt with deprecated command

```
find_package(Protobuf)
if(Protobuf_FOUND)

  protobuf_generate_python(python_sources foo.proto)
endif()
add_custom_target(proto_files DEPENDS ${python_sources})
```

CMakeLists.txt with upgraded code

```
find_package(Protobuf)
if(Protobuf_FOUND)

  protobuf_generate(

    LANGUAGE python

    PROTOS foo.proto

    OUT_VAR python_sources

  )
endif()
add_custom_target(proto_files DEPENDS ${python_sources})
```

### FindPython
Added in version 3.12.

Finds Python interpreter, compiler and development environment (include directories and libraries):

```
find_package(Python [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.19: When a version is requested, it can be specified as a simple value or as a range. For a detailed description of version range usage and capabilities, refer to the find_package() <#command:find_package> command.

The following components are supported:

- Interpreter: search for Python interpreter.

- Compiler: search for Python compiler. Only offered by IronPython.

- Development: search for development artifacts (include directories and libraries). Added in version 3.18: This component includes two sub-components which can be specified independently:

- Development.Module: search for artifacts for Python module developments.

- Development.Embed: search for artifacts for Python embedding developments.

Added in version 3.26:

•

Development.SABIModule: search for artifacts for Python module developments using the Stable Application Binary Interface <https://docs.python.org/3/c-api/stable.html>. This component is available only for version 3.2 and upper.

Added in version 3.14:

•

NumPy: search for NumPy include directories. Specifying this component imply also the components Interpreter and Development.Module.

Changed in version 4.2: The component Development.Module is no longer implied when the policy CMP0201 <#policy:CMP0201> is set to NEW.

If no COMPONENTS are specified, Interpreter is assumed.

If component Development is specified, it implies sub-components Development.Module and Development.Embed.

Changed in version 4.1: In a cross-compiling mode (i.e. the CMAKE_CROSSCOMPILING <#variable:CMAKE_CROSSCOMPILING> variable is defined to true), the following constraints, when the policy CMP0190 <#policy:CMP0190> is set to NEW, now apply to the requested components:

- Interpreter or Compiler alone: the host artifacts will be searched.

- Interpreter or Compiler with Development or any sub-component: The target artifacts will be searched. In this case, the CMAKE_CROSSCOMPILING_EMULATOR <#variable:CMAKE_CROSSCOMPILING_EMULATOR> variable must be defined and will be used to execute the interpreter or the compiler.

When both host and target artifacts are needed, two different calls to the find_package() <#command:find_package> command should be done. The Python_ARTIFACTS_PREFIX variable can be helpful in this situation.

To ensure consistent versions between components Interpreter, Compiler, Development (or one of its sub-components) and NumPy, specify all components at the same time:

```
find_package (Python COMPONENTS Interpreter Development)
```

This module looks preferably for version 3 of Python. If not found, version 2 is searched. To manage concurrent versions 3 and 2 of Python, use FindPython3 <#module:FindPython3> and FindPython2 <#module:FindPython2> modules rather than this one.

Note:

If components Interpreter and Development (or one of its sub-components) are both specified, this module search only for interpreter with same platform architecture as the one defined by CMake configuration. This constraint does not apply if only Interpreter component is specified.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Changed in version 3.14: Imported Targets <#imported-targets> are only created when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT.

Python::Interpreter

Python interpreter. This target is defined only if the Interpreter component is found.

Python::InterpreterDebug

Added in version 3.30.

Python debug interpreter. This target is defined only if the Interpreter component is found and the Python_EXECUTABLE_DEBUG variable is defined. The target is only defined on the Windows platform.

Python::InterpreterMultiConfig

Added in version 3.30.

Python interpreter. The release or debug version of the interpreter will be used, based on the context (platform, configuration). This target is defined only if the Interpreter component is found

Python::Compiler

Python compiler. This target is defined only if the Compiler component is found.

Python::Module

Added in version 3.15.

Python library for Python module. Target defined if component Development.Module is found.

Python::SABIModule

Added in version 3.26.

Python library for Python module using the Stable Application Binary Interface. Target defined if component Development.SABIModule is found.

Python::Python

Python library for Python embedding. Target defined if component Development.Embed is found.

Python::NumPy

Added in version 3.14.

NumPy Python library. Target defined if component NumPy is found. Moreover, this target has the Python::Module target as dependency.

Changed in version 4.2: This target does not have anymore the Python::Module target as dependency when the policy CMP0201 <#policy:CMP0201> is set to NEW.

### Result Variables
This module defines the following variables (see Standard Variable Names <#cmake-developer-standard-variable-names>):

Python_FOUND

Boolean indicating whether system has the Python requested components.

Python_Interpreter_FOUND

Boolean indicating whether system has the Python interpreter.

Python_EXECUTABLE

Path to the Python interpreter.

Python_EXECUTABLE_DEBUG

Added in version 3.30.

Path to the debug Python interpreter. It is only defined on the Windows platform.

Python_INTERPRETER

Added in version 3.30.

Path to the Python interpreter, defined as a generator expression <#manual:cmake-generator-expressions(7)> selecting the Python_EXECUTABLE or Python_EXECUTABLE_DEBUG variable based on the context (platform, configuration).

Python_INTERPRETER_ID

A short string unique to the interpreter. Possible values include:

- Python

- ActivePython

- Anaconda

- Canopy

- IronPython

- PyPy

Python_STDLIB

Standard platform independent installation directory. Information returned by sysconfig.get_path('stdlib').

Python_STDARCH

Standard platform dependent installation directory. Information returned by sysconfig.get_path('platstdlib').

Python_SITELIB

Third-party platform independent installation directory. Information returned by sysconfig.get_path('purelib').

Python_SITEARCH

Third-party platform dependent installation directory. Information returned by sysconfig.get_path('platlib').

Python_SOABI

Added in version 3.17.

Extension suffix for modules.

Information computed from sysconfig.get_config_var('EXT_SUFFIX') or sysconfig.get_config_var('SOABI') or python3-config --extension-suffix.

Python_SOSABI

Added in version 3.26.

Extension suffix for modules using the Stable Application Binary Interface.

Information computed from importlib.machinery.EXTENSION_SUFFIXES if the COMPONENT Interpreter was specified. Otherwise, the extension is abi3 except for Windows, MSYS and CYGWIN for which this is an empty string.

Python_Compiler_FOUND

Boolean indicating whether system has the Python compiler.

Python_COMPILER

Path to the Python compiler. Only offered by IronPython.

Python_COMPILER_ID

A short string unique to the compiler. Possible values include:

•

IronPython

Python_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python_Development_FOUND

Boolean indicating whether system has the Python development artifacts.

Python_Development.Module_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python development artifacts for Python module.

Python_Development.SABIModule_FOUND

Added in version 3.26.

Boolean indicating whether system has the Python development artifacts for Python module using the Stable Application Binary Interface.

Python_Development.Embed_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python development artifacts for Python embedding.

Python_INCLUDE_DIRS

The Python include directories.

Python_DEFINITIONS

Added in version 3.30.3.

The Python preprocessor definitions.

Python_DEBUG_POSTFIX

Added in version 3.30.

Postfix of debug python module. This variable can be used to define the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property.

Python_LINK_OPTIONS

Added in version 3.19.

The Python link options. Some configurations require specific link options for a correct build and execution.

Python_LIBRARIES

The Python libraries.

Python_LIBRARY_DIRS

The Python library directories.

Python_RUNTIME_LIBRARY_DIRS

The Python runtime library directories.

Python_SABI_LIBRARIES

Added in version 3.26.

The Python libraries for the Stable Application Binary Interface.

Python_SABI_LIBRARY_DIRS

Added in version 3.26.

The Python SABI library directories.

Python_RUNTIME_SABI_LIBRARY_DIRS

Added in version 3.26.

The Python runtime SABI library directories.

Python_VERSION

Python version.

Python_VERSION_MAJOR

Python major version.

Python_VERSION_MINOR

Python minor version.

Python_VERSION_PATCH

Python patch version.

Python_PyPy_VERSION

Added in version 3.18.

Python PyPy version.

Python_NumPy_FOUND

Added in version 3.14.

Boolean indicating whether system has the NumPy.

Python_NumPy_INCLUDE_DIRS

Added in version 3.14.

The NumPy include directories.

Python_NumPy_VERSION

Added in version 3.14.

The NumPy version.

### Hints
Python_ROOT_DIR

Define the root directory of a Python installation.

Python_USE_STATIC_LIBS

- If not defined, search for shared libraries and static libraries in that order.

- If set to TRUE, search only for static libraries.

- If set to FALSE, search only for shared libraries.

Note:

This hint will be ignored on Windows because static libraries are not available on this platform.

Python_FIND_ABI

Added in version 3.16.

This variable defines which ABIs, as defined in PEP 3149 <https://peps.python.org/pep-3149/>, should be searched.

Note:

This hint will be honored only when searched for Python version 3.

The Python_FIND_ABI variable is a 4-tuple specifying, in that order, pydebug (d), pymalloc (m), unicode (u) and gil_disabled (t) flags.

Added in version 3.30: A fourth element, specifying the gil_disabled flag (i.e. free threaded python), is added and is optional. If not specified, the value is OFF.

Each element can be set to one of the following:

- ON: Corresponding flag is selected.

- OFF: Corresponding flag is not selected.

- ANY: The two possibilities (ON and OFF) will be searched.

Note:

If Python3_FIND_ABI is not defined, any ABI, excluding the gil_disabled flag, will be searched.

From this 4-tuple, various ABIs will be searched starting from the most specialized to the most general. Moreover, when ANY is specified for pydebug and gil_disabled, debug and free threaded versions will be searched after non-debug and non-gil-disabled ones.

For example, if we have:

```
set (Python_FIND_ABI "ON" "ANY" "ANY" "ON")
```

The following flags combinations will be appended, in that order, to the artifact names: tdmu, tdm, tdu, and td.

And to search any possible ABIs:

```
set (Python_FIND_ABI "ANY" "ANY" "ANY" "ANY")
```

The following combinations, in that order, will be used: mu, m, u, <empty>, dmu, dm, du, d, tmu, tm, tu, t, tdmu, tdm, tdu, and td.

Note:

This hint is useful only on POSIX systems except for the gil_disabled flag. So, on Windows systems, when Python_FIND_ABI is defined, Python distributions from python.org <https://www.python.org/> will be found only if the value for each flag is OFF or ANY except for the fourth one (gil_disabled).

Python_FIND_STRATEGY

Added in version 3.15.

This variable defines how lookup will be done. The Python_FIND_STRATEGY variable can be set to one of the following:

- VERSION: Try to find the most recent version in all specified locations. This is the default if policy CMP0094 <#policy:CMP0094> is undefined or set to OLD.

- LOCATION: Stops lookup as soon as a version satisfying version constraints is founded. This is the default if policy CMP0094 <#policy:CMP0094> is set to NEW.

See also Python_FIND_UNVERSIONED_NAMES.

Python_FIND_REGISTRY

Added in version 3.13.

On Windows the Python_FIND_REGISTRY variable determine the order of preference between registry and environment variables. the Python_FIND_REGISTRY variable can be set to one of the following:

- FIRST: Try to use registry before environment variables. This is the default.

- LAST: Try to use registry after environment variables.

- NEVER: Never try to use registry.

Python_FIND_FRAMEWORK

Added in version 3.15.

On macOS the Python_FIND_FRAMEWORK variable determine the order of preference between Apple-style and unix-style package components. This variable can take same values as CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable.

Note:

Value ONLY is not supported so FIRST will be used instead.

If Python_FIND_FRAMEWORK is not defined, CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable will be used, if any.

Python_FIND_VIRTUALENV

Added in version 3.15.

This variable defines the handling of virtual environments managed by virtualenv or conda. It is meaningful only when a virtual environment is active (i.e. the activate script has been evaluated). In this case, it takes precedence over Python_FIND_REGISTRY and CMAKE_FIND_FRAMEWORK variables. The Python_FIND_VIRTUALENV variable can be set to one of the following:

- FIRST: The virtual environment is used before any other standard paths to look-up for the interpreter. This is the default.

- ONLY: Only the virtual environment is used to look-up for the interpreter.

- STANDARD: The virtual environment is not used to look-up for the interpreter but environment variable PATH is always considered. In this case, variable Python_FIND_REGISTRY (Windows) or CMAKE_FIND_FRAMEWORK (macOS) can be set with value LAST or NEVER to select preferably the interpreter from the virtual environment.

Added in version 3.17: Added support for conda environments.

Note:

If the component Development is requested (or one of its sub-components) and is not found or the wrong artifacts are returned, including also the component Interpreter may be helpful.

Python_FIND_IMPLEMENTATIONS

Added in version 3.18.

This variable defines, in an ordered list, the different implementations which will be searched. The Python_FIND_IMPLEMENTATIONS variable can hold the following values:

- CPython: this is the standard implementation. Various products, like Anaconda or ActivePython, rely on this implementation.

- IronPython: This implementation use the CSharp language for .NET Framework on top of the Dynamic Language Runtime (DLR). See IronPython <https://ironpython.net>.

- PyPy: This implementation use RPython language and RPython translation toolchain to produce the python interpreter. See PyPy <https://pypy.org>.

The default value is:

- Windows platform: CPython, IronPython

- Other platforms: CPython

Note:

This hint has the lowest priority of all hints, so even if, for example, you specify IronPython first and CPython in second, a python product based on CPython can be selected because, for example with Python_FIND_STRATEGY=LOCATION, each location will be search first for IronPython and second for CPython.

Note:

When IronPython is specified, on platforms other than Windows, the .Net interpreter (i.e. mono command) is expected to be available through the PATH variable.

Python_FIND_UNVERSIONED_NAMES

Added in version 3.20.

This variable defines how the generic names will be searched. Currently, it only applies to the generic names of the interpreter, namely, python3 or python2 and python. The Python_FIND_UNVERSIONED_NAMES variable can be set to one of the following values:

- FIRST: The generic names are searched before the more specialized ones (such as python2.5 for example).

- LAST: The generic names are searched after the more specialized ones. This is the default.

- NEVER: The generic name are not searched at all.

See also Python_FIND_STRATEGY.

### Artifacts Specification
Added in version 3.16.

To solve special cases, it is possible to specify directly the artifacts by setting the following variables:

Python_EXECUTABLE

The path to the interpreter.

Python_COMPILER

The path to the compiler.

Python_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python_LIBRARY

The path to the library. It will be used to compute the variables Python_LIBRARIES, Python_LIBRARY_DIRS and Python_RUNTIME_LIBRARY_DIRS.

Python_SABI_LIBRARY

Added in version 3.26.

The path to the library for Stable Application Binary Interface. It will be used to compute the variables Python_SABI_LIBRARIES, Python_SABI_LIBRARY_DIRS and Python_RUNTIME_SABI_LIBRARY_DIRS.

Python_INCLUDE_DIR

The path to the directory of the Python headers. It will be used to compute the variable Python_INCLUDE_DIRS.

Python_NumPy_INCLUDE_DIR

The path to the directory of the NumPy headers. It will be used to compute the variable Python_NumPy_INCLUDE_DIRS.

Note:

All paths must be absolute. Any artifact specified with a relative path will be ignored.

Note:

When an artifact is specified, all HINTS will be ignored and no search will be performed for this artifact. If more than one artifact is specified, it is the user's responsibility to ensure the consistency of the various artifacts.

By default, this module supports multiple calls in different directories of a project with different version/component requirements while providing correct and consistent results for each call. To support this behavior, CMake cache is not used in the traditional way which can be problematic for interactive specification. So, to enable also interactive specification, module behavior can be controlled with the following variable:

Python_ARTIFACTS_INTERACTIVE

Added in version 3.18.

Selects the behavior of the module. This is a boolean variable:

- If set to TRUE: Create CMake cache entries for the above artifact specification variables so that users can edit them interactively. This disables support for multiple version/component requirements.

- If set to FALSE or undefined: Enable multiple version/component requirements.

Python_ARTIFACTS_PREFIX

Added in version 4.0.

Define a custom prefix which will be used for the definition of all the result variables, targets, and commands. By using this variable, this module supports multiple calls in the same directory with different version/component requirements. For example, in case of cross-compilation, development components are needed but the native python interpreter can also be required:

```
find_package(Python COMPONENTS Development)
set(Python_ARTIFACTS_PREFIX "_HOST")
find_package(Python COMPONENTS Interpreter)
# Here Python_HOST_EXECUTABLE and Python_HOST::Interpreter artifacts are defined
```

Note:

For consistency with standard behavior of modules, the various standard _FOUND variables (i.e. without the custom prefix) are also defined by each call to the find_package() <#command:find_package> command.

### Commands
This module defines the command Python_add_library (when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT), which has the same semantics as add_library() <#command:add_library> and adds a dependency to target Python::Python or, when library type is MODULE, to target Python::Module or Python::SABIModule (when USE_SABI option is specified) and takes care of Python module naming rules:

```
Python_add_library (<name> [STATIC | SHARED | MODULE [USE_SABI <version>] [WITH_SOABI]]

                    <source1> [<source2> ...])
```

If the library type is not specified, MODULE is assumed.

Added in version 3.17: For MODULE library type, if option WITH_SOABI is specified, the module suffix will include the Python_SOABI value, if any.

Added in version 3.26: For MODULE type, if the option USE_SABI is specified, the preprocessor definition Py_LIMITED_API will be specified, as PRIVATE, for the target <name> with the value computed from <version> argument. The expected format for <version> is major[.minor], where each component is a numeric value. If minor component is specified, the version should be, at least, 3.2 which is the version where the Stable Application Binary Interface <https://docs.python.org/3/c-api/stable.html> was introduced. Specifying only major version 3 is equivalent to 3.2.

When option WITH_SOABI is also specified, the module suffix will include the Python_SOSABI value, if any.

Added in version 3.30: For MODULE type, the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property is initialized with the value of Python_DEBUG_POSTFIX variable if defined.

### FindPython2
Added in version 3.12.

Finds Python 2 interpreter, compiler and development environment (include directories and libraries):

```
find_package(Python2 [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.19: When a version is requested, it can be specified as a simple value or as a range. For a detailed description of version range usage and capabilities, refer to the find_package() <#command:find_package> command.

The following components are supported:

- Interpreter: search for Python 2 interpreter

- Compiler: search for Python 2 compiler. Only offered by IronPython.

- Development: search for development artifacts (include directories and libraries). Added in version 3.18: This component includes two sub-components which can be specified independently:

- Development.Module: search for artifacts for Python 2 module developments.

- Development.Embed: search for artifacts for Python 2 embedding developments.

Added in version 3.14:

•

NumPy: search for NumPy include directories. Specifying this component imply also the components Interpreter and Development.Module.

Changed in version 4.2: The component Development.Module is no longer implied when the policy CMP0201 <#policy:CMP0201> is set to NEW.

If no COMPONENTS are specified, Interpreter is assumed.

If component Development is specified, it implies sub-components Development.Module and Development.Embed.

Changed in version 4.1: In a cross-compiling mode (i.e. the CMAKE_CROSSCOMPILING <#variable:CMAKE_CROSSCOMPILING> variable is defined to true), the following constraints, when the policy CMP0190 <#policy:CMP0190> is set to NEW, now apply to the requested components:

- Interpreter or Compiler alone: the host artifacts will be searched.

- Interpreter or Compiler with Development or any sub-component: The target artifacts will be searched. In this case, the CMAKE_CROSSCOMPILING_EMULATOR <#variable:CMAKE_CROSSCOMPILING_EMULATOR> variable must be defined and will be used to execute the interpreter or the compiler.

When both host and target artifacts are needed, two different calls to the find_package() <#command:find_package> command should be done. The Python_ARTIFACTS_PREFIX variable can be helpful in this situation.

To ensure consistent versions between components Interpreter, Compiler, Development (or one of its sub-components) and NumPy, specify all components at the same time:

```
find_package (Python2 COMPONENTS Interpreter Development)
```

This module looks only for version 2 of Python. This module can be used concurrently with FindPython3 <#module:FindPython3> module to use both Python versions.

The FindPython <#module:FindPython> module can be used if Python version does not matter for you.

Note:

If components Interpreter and Development (or one of its sub-components) are both specified, this module search only for interpreter with same platform architecture as the one defined by CMake configuration. This constraint does not apply if only Interpreter component is specified.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Changed in version 3.14: Imported Targets <#imported-targets> are only created when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT.

Python2::Interpreter

Python 2 interpreter. This target is defined only if the Interpreter component is found.

Python2::InterpreterDebug

Added in version 3.30.

Python 2 debug interpreter. This target is defined only if the Interpreter component is found and the Python2_EXECUTABLE_DEBUG variable is defined. The target is only defined on the Windows platform.

Python2::InterpreterMultiConfig

Added in version 3.30.

Python 2 interpreter. The release or debug version of the interpreter will be used, based on the context (platform, configuration). This target is defined only if the Interpreter component is found

Python2::Compiler

Python 2 compiler. This target is defined only if the Compiler component is found.

Python2::Module

Added in version 3.15.

Python 2 library for Python module. Target defined if component Development.Module is found.

Python2::Python

Python 2 library for Python embedding. Target defined if component Development.Embed is found.

Python2::NumPy

Added in version 3.14.

NumPy library for Python 2. Target defined if component NumPy is found. Moreover, this target has the Python2::Module target as dependency.

Changed in version 4.2: This target does not have anymore the Python2::Module target as dependency when the policy CMP0201 <#policy:CMP0201> is set to NEW.

### Result Variables
This module defines the following variables (see Standard Variable Names <#cmake-developer-standard-variable-names>):

Python2_FOUND

Boolean indicating whether system has the Python 2 requested components.

Python2_Interpreter_FOUND

Boolean indicating whether system has the Python 2 interpreter.

Python2_EXECUTABLE

Path to the Python 2 interpreter.

Python2_EXECUTABLE_DEBUG

Added in version 3.30.

Path to the debug Python 2 interpreter. It is only defined on the Windows platform.

Python2_INTERPRETER

Added in version 3.30.

Path to the Python 2 interpreter, defined as a generator expression <#manual:cmake-generator-expressions(7)> selecting the Python2_EXECUTABLE or Python2_EXECUTABLE_DEBUG variable based on the context (platform, configuration).

Python2_INTERPRETER_ID

A short string unique to the interpreter. Possible values include:

- Python

- ActivePython

- Anaconda

- Canopy

- IronPython

- PyPy

Python2_STDLIB

Standard platform independent installation directory. Information returned by sysconfig.get_path('stdlib') or else distutils.sysconfig.get_python_lib(plat_specific=False,standard_lib=True).

Python2_STDARCH

Standard platform dependent installation directory. Information returned by sysconfig.get_path('platstdlib') or else distutils.sysconfig.get_python_lib(plat_specific=True,standard_lib=True).

Python2_SITELIB

Third-party platform independent installation directory. Information returned by sysconfig.get_path('purelib') or else distutils.sysconfig.get_python_lib(plat_specific=False,standard_lib=False).

Python2_SITEARCH

Third-party platform dependent installation directory. Information returned by sysconfig.get_path('platlib') or else distutils.sysconfig.get_python_lib(plat_specific=True,standard_lib=False).

Python2_Compiler_FOUND

Boolean indicating whether system has the Python 2 compiler.

Python2_COMPILER

Path to the Python 2 compiler. Only offered by IronPython.

Python2_COMPILER_ID

A short string unique to the compiler. Possible values include:

•

IronPython

Python2_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python2_Development_FOUND

Boolean indicating whether system has the Python 2 development artifacts.

Python2_Development.Module_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python 2 development artifacts for Python module.

Python2_Development.Embed_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python 2 development artifacts for Python embedding.

Python2_INCLUDE_DIRS

The Python 2 include directories.

Python2_DEBUG_POSTFIX

Added in version 3.30.

Postfix of debug python module. This variable can be used to define the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property.

Python2_LINK_OPTIONS

Added in version 3.19.

The Python 2 link options. Some configurations require specific link options for a correct build and execution.

Python2_LIBRARIES

The Python 2 libraries.

Python2_LIBRARY_DIRS

The Python 2 library directories.

Python2_RUNTIME_LIBRARY_DIRS

The Python 2 runtime library directories.

Python2_VERSION

Python 2 version.

Python2_VERSION_MAJOR

Python 2 major version.

Python2_VERSION_MINOR

Python 2 minor version.

Python2_VERSION_PATCH

Python 2 patch version.

Python2_PyPy_VERSION

Added in version 3.18.

Python 2 PyPy version.

Python2_NumPy_FOUND

Added in version 3.14.

Boolean indicating whether system has the NumPy.

Python2_NumPy_INCLUDE_DIRS

Added in version 3.14.

The NumPy include directories.

Python2_NumPy_VERSION

Added in version 3.14.

The NumPy version.

### Hints
Python2_ROOT_DIR

Define the root directory of a Python 2 installation.

Python2_USE_STATIC_LIBS

- If not defined, search for shared libraries and static libraries in that order.

- If set to TRUE, search only for static libraries.

- If set to FALSE, search only for shared libraries.

Note:

This hint will be ignored on Windows because static libraries are not available on this platform.

Python2_FIND_STRATEGY

Added in version 3.15.

This variable defines how lookup will be done. The Python2_FIND_STRATEGY variable can be set to one of the following:

- VERSION: Try to find the most recent version in all specified locations. This is the default if policy CMP0094 <#policy:CMP0094> is undefined or set to OLD.

- LOCATION: Stops lookup as soon as a version satisfying version constraints is founded. This is the default if policy CMP0094 <#policy:CMP0094> is set to NEW.

See also Python2_FIND_UNVERSIONED_NAMES.

Python2_FIND_REGISTRY

Added in version 3.13.

On Windows the Python2_FIND_REGISTRY variable determine the order of preference between registry and environment variables. the Python2_FIND_REGISTRY variable can be set to one of the following:

- FIRST: Try to use registry before environment variables. This is the default.

- LAST: Try to use registry after environment variables.

- NEVER: Never try to use registry.

Python2_FIND_FRAMEWORK

Added in version 3.15.

On macOS the Python2_FIND_FRAMEWORK variable determine the order of preference between Apple-style and unix-style package components. This variable can take same values as CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable.

Note:

Value ONLY is not supported so FIRST will be used instead.

If Python2_FIND_FRAMEWORK is not defined, CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable will be used, if any.

Python2_FIND_VIRTUALENV

Added in version 3.15.

This variable defines the handling of virtual environments managed by virtualenv or conda. It is meaningful only when a virtual environment is active (i.e. the activate script has been evaluated). In this case, it takes precedence over Python2_FIND_REGISTRY and CMAKE_FIND_FRAMEWORK variables. The Python2_FIND_VIRTUALENV variable can be set to one of the following:

- FIRST: The virtual environment is used before any other standard paths to look-up for the interpreter. This is the default.

- ONLY: Only the virtual environment is used to look-up for the interpreter.

- STANDARD: The virtual environment is not used to look-up for the interpreter but environment variable PATH is always considered. In this case, variable Python2_FIND_REGISTRY (Windows) or CMAKE_FIND_FRAMEWORK (macOS) can be set with value LAST or NEVER to select preferably the interpreter from the virtual environment.

Added in version 3.17: Added support for conda environments.

Note:

If the component Development is requested (or one of its sub-components) and is not found or the wrong artifacts are returned, including also the component Interpreter may be helpful.

Python2_FIND_IMPLEMENTATIONS

Added in version 3.18.

This variable defines, in an ordered list, the different implementations which will be searched. The Python2_FIND_IMPLEMENTATIONS variable can hold the following values:

- CPython: this is the standard implementation. Various products, like Anaconda or ActivePython, rely on this implementation.

- IronPython: This implementation use the CSharp language for .NET Framework on top of the Dynamic Language Runtime (DLR). See IronPython <https://ironpython.net>.

- PyPy: This implementation use RPython language and RPython translation toolchain to produce the python interpreter. See PyPy <https://pypy.org>.

The default value is:

- Windows platform: CPython, IronPython

- Other platforms: CPython

Note:

This hint has the lowest priority of all hints, so even if, for example, you specify IronPython first and CPython in second, a python product based on CPython can be selected because, for example with Python2_FIND_STRATEGY=LOCATION, each location will be search first for IronPython and second for CPython.

Note:

When IronPython is specified, on platforms other than Windows, the .Net interpreter (i.e. mono command) is expected to be available through the PATH variable.

Python2_FIND_UNVERSIONED_NAMES

Added in version 3.20.

This variable defines how the generic names will be searched. Currently, it only applies to the generic names of the interpreter, namely, python2 and python. The Python2_FIND_UNVERSIONED_NAMES variable can be set to one of the following values:

- FIRST: The generic names are searched before the more specialized ones (such as python2.5 for example).

- LAST: The generic names are searched after the more specialized ones. This is the default.

- NEVER: The generic name are not searched at all.

See also Python2_FIND_STRATEGY.

### Artifacts Specification
Added in version 3.16.

To solve special cases, it is possible to specify directly the artifacts by setting the following variables:

Python2_EXECUTABLE

The path to the interpreter.

Python2_COMPILER

The path to the compiler.

Python2_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python2_LIBRARY

The path to the library. It will be used to compute the variables Python2_LIBRARIES, Python2_LIBRARY_DIRS and Python2_RUNTIME_LIBRARY_DIRS.

Python2_INCLUDE_DIR

The path to the directory of the Python headers. It will be used to compute the variable Python2_INCLUDE_DIRS.

Python2_NumPy_INCLUDE_DIR

The path to the directory of the NumPy headers. It will be used to compute the variable Python2_NumPy_INCLUDE_DIRS.

Note:

All paths must be absolute. Any artifact specified with a relative path will be ignored.

Note:

When an artifact is specified, all HINTS will be ignored and no search will be performed for this artifact. If more than one artifact is specified, it is the user's responsibility to ensure the consistency of the various artifacts.

By default, this module supports multiple calls in different directories of a project with different version/component requirements while providing correct and consistent results for each call. To support this behavior, CMake cache is not used in the traditional way which can be problematic for interactive specification. So, to enable also interactive specification, module behavior can be controlled with the following variable:

Python2_ARTIFACTS_INTERACTIVE

Added in version 3.18.

Selects the behavior of the module. This is a boolean variable:

- If set to TRUE: Create CMake cache entries for the above artifact specification variables so that users can edit them interactively. This disables support for multiple version/component requirements.

- If set to FALSE or undefined: Enable multiple version/component requirements.

Python2_ARTIFACTS_PREFIX

Added in version 4.0.

Define a custom prefix which will be used for the definition of all the result variables, targets, and commands. By using this variable, this module supports multiple calls in the same directory with different version/component requirements. For example, in case of cross-compilation, development components are needed but the native python interpreter can also be required:

```
find_package(Python2 COMPONENTS Development)
set(Python2_ARTIFACTS_PREFIX "_HOST")
find_package(Python2 COMPONENTS Interpreter)
# Here Python2_HOST_EXECUTABLE and Python2_HOST::Interpreter artifacts are defined
```

Note:

For consistency with standard behavior of modules, the various standard _FOUND variables (i.e. without the custom prefix) are also defined by each call to the find_package() <#command:find_package> command.

### Commands
This module defines the command Python2_add_library (when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT), which has the same semantics as add_library() <#command:add_library> and adds a dependency to target Python2::Python or, when library type is MODULE, to target Python2::Module and takes care of Python module naming rules:

```
Python2_add_library (<name> [STATIC | SHARED | MODULE]

                     <source1> [<source2> ...])
```

If library type is not specified, MODULE is assumed.

Added in version 3.30: For MODULE type, the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property is initialized with the value of Python2_DEBUG_POSTFIX variable if defined.

### FindPython3
Added in version 3.12.

Finds Python 3 interpreter, compiler and development environment (include directories and libraries):

```
find_package(Python3 [<version>] [COMPONENTS <components>...] [...])
```

Added in version 3.19: When a version is requested, it can be specified as a simple value or as a range. For a detailed description of version range usage and capabilities, refer to the find_package() <#command:find_package> command.

The following components are supported:

- Interpreter: search for Python 3 interpreter

- Compiler: search for Python 3 compiler. Only offered by IronPython.

- Development: search for development artifacts (include directories and libraries). Added in version 3.18: This component includes two sub-components which can be specified independently:

- Development.Module: search for artifacts for Python 3 module developments.

- Development.Embed: search for artifacts for Python 3 embedding developments.

Added in version 3.26:

•

Development.SABIModule: search for artifacts for Python 3 module developments using the Stable Application Binary Interface <https://docs.python.org/3/c-api/stable.html>. This component is available only for version 3.2 and upper.

Added in version 3.14:

•

NumPy: search for NumPy include directories. Specifying this component imply also the components Interpreter and Development.Module.

Changed in version 4.2: The component Development.Module is no longer implied when the policy CMP0201 <#policy:CMP0201> is set to NEW.

If no COMPONENTS are specified, Interpreter is assumed.

If component Development is specified, it implies sub-components Development.Module and Development.Embed.

Changed in version 4.1: In a cross-compiling mode (i.e. the CMAKE_CROSSCOMPILING <#variable:CMAKE_CROSSCOMPILING> variable is defined to true), the following constraints, when the policy CMP0190 <#policy:CMP0190> is set to NEW, now apply to the requested components:

- Interpreter or Compiler alone: the host artifacts will be searched.

- Interpreter or Compiler with Development or any sub-component: The target artifacts will be searched. In this case, the CMAKE_CROSSCOMPILING_EMULATOR <#variable:CMAKE_CROSSCOMPILING_EMULATOR> variable must be defined and will be used to execute the interpreter or the compiler.

When both host and target artifacts are needed, two different calls to the find_package() <#command:find_package> command should be done. The Python_ARTIFACTS_PREFIX variable can be helpful in this situation.

To ensure consistent versions between components Interpreter, Compiler, Development (or one of its sub-components) and NumPy, specify all components at the same time:

```
find_package (Python3 COMPONENTS Interpreter Development)
```

This module looks only for version 3 of Python. This module can be used concurrently with FindPython2 <#module:FindPython2> module to use both Python versions.

The FindPython <#module:FindPython> module can be used if Python version does not matter for you.

Note:

If components Interpreter and Development (or one of its sub-components) are both specified, this module search only for interpreter with same platform architecture as the one defined by CMake configuration. This constraint does not apply if only Interpreter component is specified.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Changed in version 3.14: Imported Targets <#imported-targets> are only created when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT.

Python3::Interpreter

Python 3 interpreter. This target is defined only if the Interpreter component is found.

Python3::InterpreterDebug

Added in version 3.30.

Python 3 debug interpreter. This target is defined only if the Interpreter component is found and the Python3_EXECUTABLE_DEBUG variable is defined. The target is only defined on the Windows platform.

Python3::InterpreterMultiConfig

Added in version 3.30.

Python 3 interpreter. The release or debug version of the interpreter will be used, based on the context (platform, configuration). This target is defined only if the Interpreter component is found

Python3::Compiler

Python 3 compiler. This target is defined only if the Compiler component is found.

Python3::Module

Added in version 3.15.

Python 3 library for Python module. Target defined if component Development.Module is found.

Python3::SABIModule

Added in version 3.26.

Python 3 library for Python module using the Stable Application Binary Interface. Target defined if component Development.SABIModule is found.

Python3::Python

Python 3 library for Python embedding. Target defined if component Development.Embed is found.

Python3::NumPy

Added in version 3.14.

NumPy library for Python 3. Target defined if component NumPy is found. Moreover, this target has the Python3::Module target as dependency.

Changed in version 4.2: This target does not have anymore the Python3::Module target as dependency when the policy CMP0201 <#policy:CMP0201> is set to NEW.

### Result Variables
This module defines the following variables (see Standard Variable Names <#cmake-developer-standard-variable-names>):

Python3_FOUND

Boolean indicating whether system has the Python 3 requested components.

Python3_Interpreter_FOUND

Boolean indicating whether system has the Python 3 interpreter.

Python3_EXECUTABLE

Path to the Python 3 interpreter.

Python3_EXECUTABLE_DEBUG

Added in version 3.30.

Path to the debug Python 3 interpreter. It is only defined on Windows platform.

Python3_INTERPRETER

Added in version 3.30.

Path to the Python 3 interpreter, defined as a generator expression <#manual:cmake-generator-expressions(7)> selecting the Python3_EXECUTABLE or Python3_EXECUTABLE_DEBUG variable based on the context (platform, configuration).

Python3_INTERPRETER_ID

A short string unique to the interpreter. Possible values include:

- Python

- ActivePython

- Anaconda

- Canopy

- IronPython

- PyPy

Python3_STDLIB

Standard platform independent installation directory. Information returned by sysconfig.get_path('stdlib').

Python3_STDARCH

Standard platform dependent installation directory. Information returned by sysconfig.get_path('platstdlib').

Python3_SITELIB

Third-party platform independent installation directory. Information returned by sysconfig.get_path('purelib').

Python3_SITEARCH

Third-party platform dependent installation directory. Information returned by sysconfig.get_path('platlib').

Python3_SOABI

Added in version 3.17.

Extension suffix for modules.

Information computed from sysconfig.get_config_var('EXT_SUFFIX') or sysconfig.get_config_var('SOABI') or python3-config --extension-suffix.

Python3_SOSABI

Added in version 3.26.

Extension suffix for modules using the Stable Application Binary Interface.

Information computed from importlib.machinery.EXTENSION_SUFFIXES if the COMPONENT Interpreter was specified. Otherwise, the extension is abi3 except for Windows, MSYS and CYGWIN for which this is an empty string.

Python3_Compiler_FOUND

Boolean indicating whether system has the Python 3 compiler.

Python3_COMPILER

Path to the Python 3 compiler. Only offered by IronPython.

Python3_COMPILER_ID

A short string unique to the compiler. Possible values include:

•

IronPython

Python3_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python3_Development_FOUND

Boolean indicating whether system has the Python 3 development artifacts.

Python3_Development.Module_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python 3 development artifacts for Python module.

Python3_Development.SABIModule_FOUND

Added in version 3.26.

Boolean indicating whether system has the Python 3 development artifacts for Python module using the Stable Application Binary Interface.

Python3_Development.Embed_FOUND

Added in version 3.18.

Boolean indicating whether system has the Python 3 development artifacts for Python embedding.

Python3_INCLUDE_DIRS

The Python 3 include directories.

Python3_DEFINITIONS

Added in version 3.30.3.

The Python 3 preprocessor definitions.

Python3_DEBUG_POSTFIX

Added in version 3.30.

Postfix of debug python module. This variable can be used to define the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property.

Python3_LINK_OPTIONS

Added in version 3.19.

The Python 3 link options. Some configurations require specific link options for a correct build and execution.

Python3_LIBRARIES

The Python 3 libraries.

Python3_LIBRARY_DIRS

The Python 3 library directories.

Python3_RUNTIME_LIBRARY_DIRS

The Python 3 runtime library directories.

Python3_SABI_LIBRARIES

Added in version 3.26.

The Python 3 libraries for the Stable Application Binary Interface.

Python3_SABI_LIBRARY_DIRS

Added in version 3.26.

The Python 3 SABI library directories.

Python3_RUNTIME_SABI_LIBRARY_DIRS

Added in version 3.26.

The Python 3 runtime SABI library directories.

Python3_VERSION

Python 3 version.

Python3_VERSION_MAJOR

Python 3 major version.

Python3_VERSION_MINOR

Python 3 minor version.

Python3_VERSION_PATCH

Python 3 patch version.

Python3_PyPy_VERSION

Added in version 3.18.

Python 3 PyPy version.

Python3_NumPy_FOUND

Added in version 3.14.

Boolean indicating whether system has the NumPy.

Python3_NumPy_INCLUDE_DIRS

Added in version 3.14.

The NumPy include directories.

Python3_NumPy_VERSION

Added in version 3.14.

The NumPy version.

### Hints
Python3_ROOT_DIR

Define the root directory of a Python 3 installation.

Python3_USE_STATIC_LIBS

- If not defined, search for shared libraries and static libraries in that order.

- If set to TRUE, search only for static libraries.

- If set to FALSE, search only for shared libraries.

Note:

This hint will be ignored on Windows because static libraries are not available on this platform.

Python3_FIND_ABI

Added in version 3.16.

This variable defines which ABIs, as defined in PEP 3149 <https://peps.python.org/pep-3149/>, should be searched.

The Python3_FIND_ABI variable is a 4-tuple specifying, in that order, pydebug (d), pymalloc (m), unicode (u) and gil_disabled (t) flags.

Added in version 3.30: A fourth element, specifying the gil_disabled flag (i.e. free threaded python), is added and is optional. If not specified, the value is OFF.

Each element can be set to one of the following:

- ON: Corresponding flag is selected.

- OFF: Corresponding flag is not selected.

- ANY: The two possibilities (ON and OFF) will be searched.

Note:

If Python3_FIND_ABI is not defined, any ABI, excluding the gil_disabled flag, will be searched.

From this 4-tuple, various ABIs will be searched starting from the most specialized to the most general. Moreover, when ANY is specified for pydebug and gil_disabled, debug and free threaded versions will be searched after non-debug and non-gil-disabled ones.

For example, if we have:

```
set (Python3_FIND_ABI "ON" "ANY" "ANY" "ON")
```

The following flags combinations will be appended, in that order, to the artifact names: tdmu, tdm, tdu, and td.

And to search any possible ABIs:

```
set (Python3_FIND_ABI "ANY" "ANY" "ANY" "ANY")
```

The following combinations, in that order, will be used: mu, m, u, <empty>, dmu, dm, du, d, tmu, tm, tu, t, tdmu, tdm, tdu, and td.

Note:

This hint is useful only on POSIX systems except for the gil_disabled flag. So, on Windows systems, when Python_FIND_ABI is defined, Python distributions from python.org <https://www.python.org/> will be found only if the value for each flag is OFF or ANY except for the fourth one (gil_disabled).

Python3_FIND_STRATEGY

Added in version 3.15.

This variable defines how lookup will be done. The Python3_FIND_STRATEGY variable can be set to one of the following:

- VERSION: Try to find the most recent version in all specified locations. This is the default if policy CMP0094 <#policy:CMP0094> is undefined or set to OLD.

- LOCATION: Stops lookup as soon as a version satisfying version constraints is founded. This is the default if policy CMP0094 <#policy:CMP0094> is set to NEW.

See also Python3_FIND_UNVERSIONED_NAMES.

Python3_FIND_REGISTRY

Added in version 3.13.

On Windows the Python3_FIND_REGISTRY variable determine the order of preference between registry and environment variables. The Python3_FIND_REGISTRY variable can be set to one of the following:

- FIRST: Try to use registry before environment variables. This is the default.

- LAST: Try to use registry after environment variables.

- NEVER: Never try to use registry.

Python3_FIND_FRAMEWORK

Added in version 3.15.

On macOS the Python3_FIND_FRAMEWORK variable determine the order of preference between Apple-style and unix-style package components. This variable can take same values as CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable.

Note:

Value ONLY is not supported so FIRST will be used instead.

If Python3_FIND_FRAMEWORK is not defined, CMAKE_FIND_FRAMEWORK <#variable:CMAKE_FIND_FRAMEWORK> variable will be used, if any.

Python3_FIND_VIRTUALENV

Added in version 3.15.

This variable defines the handling of virtual environments managed by virtualenv or conda. It is meaningful only when a virtual environment is active (i.e. the activate script has been evaluated). In this case, it takes precedence over Python3_FIND_REGISTRY and CMAKE_FIND_FRAMEWORK variables. The Python3_FIND_VIRTUALENV variable can be set to one of the following:

- FIRST: The virtual environment is used before any other standard paths to look-up for the interpreter. This is the default.

- ONLY: Only the virtual environment is used to look-up for the interpreter.

- STANDARD: The virtual environment is not used to look-up for the interpreter but environment variable PATH is always considered. In this case, variable Python3_FIND_REGISTRY (Windows) or CMAKE_FIND_FRAMEWORK (macOS) can be set with value LAST or NEVER to select preferably the interpreter from the virtual environment.

Added in version 3.17: Added support for conda environments.

Note:

If the component Development is requested (or one of its sub-components) and is not found or the wrong artifacts are returned, including also the component Interpreter may be helpful.

Python3_FIND_IMPLEMENTATIONS

Added in version 3.18.

This variable defines, in an ordered list, the different implementations which will be searched. The Python3_FIND_IMPLEMENTATIONS variable can hold the following values:

- CPython: this is the standard implementation. Various products, like Anaconda or ActivePython, rely on this implementation.

- IronPython: This implementation use the CSharp language for .NET Framework on top of the Dynamic Language Runtime (DLR). See IronPython <https://ironpython.net>.

- PyPy: This implementation use RPython language and RPython translation toolchain to produce the python interpreter. See PyPy <https://pypy.org>.

The default value is:

- Windows platform: CPython, IronPython

- Other platforms: CPython

Note:

This hint has the lowest priority of all hints, so even if, for example, you specify IronPython first and CPython in second, a python product based on CPython can be selected because, for example with Python3_FIND_STRATEGY=LOCATION, each location will be search first for IronPython and second for CPython.

Note:

When IronPython is specified, on platforms other than Windows, the .Net interpreter (i.e. mono command) is expected to be available through the PATH variable.

Python3_FIND_UNVERSIONED_NAMES

Added in version 3.20.

This variable defines how the generic names will be searched. Currently, it only applies to the generic names of the interpreter, namely, python3 and python. The Python3_FIND_UNVERSIONED_NAMES variable can be set to one of the following values:

- FIRST: The generic names are searched before the more specialized ones (such as python3.5 for example).

- LAST: The generic names are searched after the more specialized ones. This is the default.

- NEVER: The generic name are not searched at all.

See also Python3_FIND_STRATEGY.

### Artifacts Specification
Added in version 3.16.

To solve special cases, it is possible to specify directly the artifacts by setting the following variables:

Python3_EXECUTABLE

The path to the interpreter.

Python3_COMPILER

The path to the compiler.

Python3_DOTNET_LAUNCHER

Added in version 3.18.

The .Net interpreter. Only used by IronPython implementation.

Python3_LIBRARY

The path to the library. It will be used to compute the variables Python3_LIBRARIES, Python3_LIBRARY_DIRS and Python3_RUNTIME_LIBRARY_DIRS.

Python3_SABI_LIBRARY

Added in version 3.26.

The path to the library for Stable Application Binary Interface. It will be used to compute the variables Python3_SABI_LIBRARIES, Python3_SABI_LIBRARY_DIRS and Python3_RUNTIME_SABI_LIBRARY_DIRS.

Python3_INCLUDE_DIR

The path to the directory of the Python headers. It will be used to compute the variable Python3_INCLUDE_DIRS.

Python3_NumPy_INCLUDE_DIR

The path to the directory of the NumPy headers. It will be used to compute the variable Python3_NumPy_INCLUDE_DIRS.

Note:

All paths must be absolute. Any artifact specified with a relative path will be ignored.

Note:

When an artifact is specified, all HINTS will be ignored and no search will be performed for this artifact. If more than one artifact is specified, it is the user's responsibility to ensure the consistency of the various artifacts.

By default, this module supports multiple calls in different directories of a project with different version/component requirements while providing correct and consistent results for each call. To support this behavior, CMake cache is not used in the traditional way which can be problematic for interactive specification. So, to enable also interactive specification, module behavior can be controlled with the following variable:

Python3_ARTIFACTS_INTERACTIVE

Added in version 3.18.

Selects the behavior of the module. This is a boolean variable:

- If set to TRUE: Create CMake cache entries for the above artifact specification variables so that users can edit them interactively. This disables support for multiple version/component requirements.

- If set to FALSE or undefined: Enable multiple version/component requirements.

Python3_ARTIFACTS_PREFIX

Added in version 4.0.

Define a custom prefix which will be used for the definition of all the result variables, targets, and commands. By using this variable, this module supports multiple calls in the same directory with different version/component requirements. For example, in case of cross-compilation, development components are needed but the native python interpreter can also be required:

```
find_package(Python3 COMPONENTS Development)
set(Python3_ARTIFACTS_PREFIX "_HOST")
find_package(Python3 COMPONENTS Interpreter)
# Here Python3_HOST_EXECUTABLE and Python3_HOST::Interpreter artifacts are defined
```

Note:

For consistency with standard behavior of modules, the various standard _FOUND variables (i.e. without the custom prefix) are also defined by each call to the find_package() <#command:find_package> command.

### Commands
This module defines the command Python3_add_library (when CMAKE_ROLE <#prop_gbl:CMAKE_ROLE> is PROJECT), which has the same semantics as add_library() <#command:add_library> and adds a dependency to target Python3::Python or, when library type is MODULE, to target Python3::Module or Python3::SABIModule (when USE_SABI option is specified) and takes care of Python module naming rules:

```
Python3_add_library (<name> [STATIC | SHARED | MODULE [USE_SABI <version>] [WITH_SOABI]]

                     <source1> [<source2> ...])
```

If the library type is not specified, MODULE is assumed.

Added in version 3.17: For MODULE library type, if option WITH_SOABI is specified, the module suffix will include the Python3_SOABI value, if any.

Added in version 3.26: For MODULE type, if the option USE_SABI is specified, the preprocessor definition Py_LIMITED_API will be specified, as PRIVATE, for the target <name> with the value computed from <version> argument. The expected format for <version> is major[.minor], where each component is a numeric value. If minor component is specified, the version should be, at least, 3.2 which is the version where the Stable Application Binary Interface <https://docs.python.org/3/c-api/stable.html> was introduced. Specifying only major version 3 is equivalent to 3.2.

When option WITH_SOABI is also specified, the module suffix will include the Python3_SOSABI value, if any.

Added in version 3.30: For MODULE type, the DEBUG_POSTFIX <#prop_tgt:DEBUG_POSTFIX> target property is initialized with the value of Python3_DEBUG_POSTFIX variable if defined.

### FindQt3
Finds Qt3, a cross-platform application development framework for creating graphical user interfaces and applications:

```
find_package(Qt3 [<version>] [...])
```

Note:

This module is for Qt version 3. As of Qt version 5, the Qt upstream also provides an exported configuration to find Qt. New code should follow the cmake-qt(7) <#manual:cmake-qt(7)> instead of using this module.

### Result Variables
This module defines the following variables:

Qt3_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Qt3 was found.

QT_FOUND

Same as Qt3_FOUND. Boolean indicating whether (the requested version of) Qt3 was found. This variable is provided for compatibility with other Qt find modules.

Qt3_VERSION

Added in version 4.2.

The version of Qt3 that was found.

QT_LIBRARIES

Libraries needed to link against for using Qt3.

QT_DEFINITIONS

A list of compile definitions to use when compiling code that uses Qt3.

### Cache Variables
The following cache variables may also be set:

QT_INCLUDE_DIR

The directory containing qt.h and other Qt3 header files.

The following cache variables may also be set but are not meant for general use:

QT_MOC_EXECUTABLE

Path to the moc tool.

QT_UIC_EXECUTABLE

Path to the uic tool.

QT_QT_LIBRARY

Path to the Qt3 library.

QT_QTMAIN_LIBRARY

Path to the qtmain library. This is only required by Qt3 on Windows.

### Hints
QT_MT_REQUIRED

To search for the multithreaded version of Qt3, set this variable to TRUE before looking for Qt3.

### Deprecated Variables
The following variables are provided for backward compatibility:

QT_VERSION_STRING

Deprecated since version 4.2: Use Qt3_VERSION, which has the same value.

The version of Qt3 that was found.

### Examples
Finding Qt3 on the system:

```
find_package(Qt3)
if(Qt3_FOUND)

  target_link_libraries(foo PRIVATE ${QT_LIBRARIES})

  target_include_directories(foo PRIVATE ${QT_INCLUDE_DIR})

  target_compile_definitions(foo PRIVATE ${QT_DEFINITIONS})
endif()
```

Looking for the multithreaded version of Qt3:

```
set(QT_MT_REQUIRED TRUE)
find_package(Qt3)
```

### FindQt4
Finds Qt4, a cross-platform application development framework for creating graphical user interfaces and applications:

```
find_package(Qt4 [<version>] [...])
```

This module defines a number of imported targets, macros, and variables to use Qt4 in the project.

Note:

This module is for Qt version 4. As of Qt version 5, the Qt upstream also provides an exported configuration to find Qt. New code should follow the cmake-qt(7) <#manual:cmake-qt(7)> instead of using this module.

To detect the Qt4 package, the Qt4 qmake tool is required and must be available in the system path.

Note:

When using Imported Targets <#imported-targets>, the qtmain.lib static library is automatically linked on Windows for WIN32 <#prop_tgt:WIN32_EXECUTABLE> executables. To disable this globally, set the QT4_NO_LINK_QTMAIN variable before finding Qt4. To disable this for a particular executable, set the QT4_NO_LINK_QTMAIN target property to TRUE on that executable.

### Qt Build Tools
Qt relies on some bundled tools for code generation, such as moc for meta-object code generation, uic for widget layout and population, and rcc for virtual filesystem content generation. These tools may be automatically invoked by cmake(1) <#manual:cmake(1)> if the appropriate conditions are met. See cmake-qt(7) <#manual:cmake-qt(7)> for more.

### Imported Targets
Qt libraries can be linked using their corresponding Imported Target <#imported-targets> with the target_link_libraries() <#command:target_link_libraries> command:

```
target_link_libraries(myexe Qt4::QtGui Qt4::QtXml)
```

Linking to an imported target automatically applies the correct include directories and compile definitions when building myexe.

Imported targets also manage their dependencies, so listing Qt4::QtCore is unnecessary if another Qt library depends on it. Likewise, Qt4::QtGui is automatically included when linking Qt4::QtDeclarative. Targets can be checked for existence using if(TARGET) <#target> command.

If both debug and release versions of a Qt toolkit library are available, CMake selects the appropriate one based on the build configuration <#build-configurations>.

This module provides the following imported targets, if found:

Qt4::QtCore

The QtCore target

Qt4::QtGui

The QtGui target

Qt4::Qt3Support

The Qt3Support target

Qt4::QtAssistant

The QtAssistant target

Qt4::QtAssistantClient

The QtAssistantClient target

Qt4::QAxContainer

The QAxContainer target (Windows only)

Qt4::QAxServer

The QAxServer target (Windows only)

Qt4::QtDBus

The QtDBus target

Qt4::QtDeclarative

The QtDeclarative target

Qt4::QtDesigner

The QtDesigner target

Qt4::QtDesignerComponents

The QtDesignerComponents target

Qt4::QtHelp

The QtHelp target

Qt4::QtMotif

The QtMotif target

Qt4::QtMultimedia

The QtMultimedia target

Qt4::QtNetwork

The QtNetwork target

Qt4::QtNsPlugin

The QtNsPlugin target

Qt4::QtOpenGL

The QtOpenGL target

Qt4::QtScript

The QtScript target

Qt4::QtScriptTools

The QtScriptTools target

Qt4::QtSql

The QtSql target

Qt4::QtSvg

The QtSvg target

Qt4::QtTest

The QtTest target

Qt4::QtUiTools

The QtUiTools target

Qt4::QtWebKit

The QtWebKit target

Qt4::QtXml

The QtXml target

Qt4::QtXmlPatterns

The QtXmlPatterns target

Qt4::phonon

The phonon target

### Result Variables
This module defines the following variables:

Qt4_FOUND

Boolean indicating whether (the requested version of) Qt4 was found.

QT_FOUND

Same as Qt4_FOUND. Boolean indicating whether (the requested version of) Qt4 was found. This variable is available for compatibility with other Qt find modules.

QT_VERSION_MAJOR

The major version of Qt found.

QT_VERSION_MINOR

The minor version of Qt found.

QT_VERSION_PATCH

The patch version of Qt found.

### Hints
QT4_NO_LINK_QTMAIN

If set to boolean true before finding Qt4, it globally disables linking qtmain.lib static library on Windows.

### Macros
In some cases it can be necessary or useful to invoke the Qt build tools in a more-manual way. This module provides the following macros to add targets for such uses:

qt4_wrap_cpp

Creates build rules for running moc on a given list of input files:

```
qt4_wrap_cpp(<variable> <files>... [TARGET <target>] [OPTIONS <options>...])
```

This macro creates build rules for processing a list of input files <files> that contain Qt classes with the Q_OBJECT declaration. Per-directory preprocessor definitions are also added.

<variable>

Name of a variable where a list of generated output files is stored.

<files>

One or more input source files.

TARGET

If specified, the INTERFACE_INCLUDE_DIRECTORIES and INTERFACE_COMPILE_DEFINITIONS target properties from the <target> are passed to moc.

OPTIONS

Optional list of options given to moc, such as those found when executing moc -help.

Note:

Instead of using qt4_wrap_cpp(), the CMAKE_AUTOMOC <#variable:CMAKE_AUTOMOC> variable can be set to process source files with moc automatically.

qt4_wrap_ui

Creates build rules for running uic on a given list of Qt designer ui input files:

```
qt4_wrap_ui(<variable> <files>... [OPTIONS <options>...])
```

<variable>

Name of a variable where a list of generated output filenames is stored.

<files>

One or more Qt designer ui input source files.

OPTIONS

Optional list of options given to uic, such as those found when executing uic -help.

Note:

Instead of using qt4_wrap_ui(), the CMAKE_AUTOUIC <#variable:CMAKE_AUTOUIC> variable can be set to process ui files with uic automatically.

qt4_add_resources

Creates build rules for running rcc on a given list of input Qt resource files:

```
qt4_add_resources(<variable> <files>... [OPTIONS <options>...])
```

<variable>

Name of a variable where a list of generated output filenames is stored.

<files>

One or more Qt resource input source files.

OPTIONS

Optional list of options given to rcc, such as those found when executing rcc -help.

Note:

Instead of using qt4_add_resources(), the CMAKE_AUTORCC <#variable:CMAKE_AUTORCC> variable can be set to process resource files with rcc automatically.

qt4_generate_moc

Creates a build rule that generates output file by running moc on a given input file.

```
qt4_generate_moc(<input-file> <output-file> [TARGET <target>])
```

This macro creates a build rule for <input-file> to generate <output-file>. Use this if for some reason qt4_wrap_cpp() isn't feasible, e.g. because a custom filename is needed for the moc file or similar.

TARGET

If specified, the INTERFACE_INCLUDE_DIRECTORIES and INTERFACE_COMPILE_DEFINITIONS target properties from the <target> are passed to moc.

qt4_add_dbus_interface

Creates the interface header and implementation files from an interface XML file:

```
qt4_add_dbus_interface(<variable> <interface-file> <basename>)
```

This macro creates the interface header (<basename>.h) and implementation files (<basename>.{cpp,moc}) from the given interface XML file <interface-file> and adds it to the variable which contains a list of sources (specified as variable name <variable>).

Additional parameters can be passed to the qdbusxml2cpp call by setting the following source file properties on the input file <interface-file>:

INCLUDE

The given file will be included in the generate interface header.

CLASSNAME

The name of the generated class.

NO_NAMESPACE

The generated class will not be wrapped in a namespace.

qt4_add_dbus_interfaces

Creates the interface header and implementation files from multiple interface XML files:

```
qt4_add_dbus_interfaces(<variable> <interface-files>...)
```

This macro creates the interface header and implementation files for all listed interface XML files <interface-files>. The basename will be automatically determined from the name of the XML file. The resulting output files list is stored in a variable <variable>.

The source file properties described for qt4_add_dbus_interface() also apply here.

qt4_add_dbus_adaptor

Generates an adaptor class for a D-Bus interface:

```
qt4_add_dbus_adaptor(<variable> <xmlfile> <parent-header> <parent-classname>

                     [<basename>] [<classname>])
```

Creates a D-Bus adaptor (header and implementation file) from the XML file describing the interface, and adds it to the list of sources. The adaptor forwards the calls to a parent class, defined in <parent-header> and named <parent-classname>. The generated filenames will be <basename>adaptor.{cpp,h} where <basename> defaults to the basename of the XML file if not given. If <classname> is provided, then it will be used as the classname of the adaptor itself. Generated filenames are stored in a variable <variable>.

qt4_generate_dbus_interface

Generates a D-Bus XML interface file from a given header file:

```
qt4_generate_dbus_interface(<header> [<interface>] [OPTIONS <options>...])
```

This macro creates a build rule to extract declaration from the given <header> file to generate a corresponding XML interface file.

<header>

Path to header file from which XML interface file is generated.

<interface>

Path to the generated XML interface file. If this optional argument is omitted, the name of the interface file is constructed from the basename of the header with the suffix .xml appended. A relative path is interpreted as relative to CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>.

OPTIONS

A list of options that may be given to qdbuscpp2xml, such as those found when executing qdbuscpp2xml --help.

qt4_create_translation

Creates build rules for generating TS and QM files:

```
qt4_create_translation(<qm-files-var> <directories>... <sources>...

                       <ts-files>... [OPTIONS <options>...])
```

This macro creates build rules to generate TS (Translation Source files .ts) files via lupdate and QM (Qt Message files .qm) files via lrelease from the given <directories> and/or <sources>. The TS files are created and/or updated in the source tree (unless given with full paths). The QM files are generated in the build tree.

<qm-files-var>

A list of generated QM files is stored in this variable. Updating the translations can be done by adding the <qm-files-var> to the source list of the project library/executable, so they are always updated, or by adding a custom target to control when they get updated/generated.

<directories>

A list of directories containing source files.

<sources>

A list of source files.

<ts-files>

A list of TS (Translation Source) files.

OPTIONS

Optional list of flags passed to lupdate, such as -extensions, to specify file extensions for directory scanning.

qt4_add_translation

Creates build rules for generating QM files from the given TS files:

```
qt4_add_translation(<qm-files-var> <ts-files>...)
```

This macro creates build rules for generating QM files from the given TS files and stores a list of generated filenames of QM files in the <qm-files-var> variable. The <ts-files> must exist and are not updated in any way.

qt4_automoc

Deprecated since version 2.8.11: Use feature provided by the CMAKE_AUTOMOC <#variable:CMAKE_AUTOMOC> variable instead.

Runs moc on input files:

```
qt4_automoc(<source-files>... [TARGET <target>])
```

This macro can be used to have moc automatically handled. For example, if there are foo.h and foo.cpp files, and in foo.h a class uses the Q_OBJECT preprocessor macro, moc has to run on it. If using qt4_wrap_cpp() isn't wanted (however, it is reliable and mature), the #include "foo.moc" can be inserted in foo.cpp and then foo.cpp given as argument to qt4_automoc(). This will scan all listed files <source-files> at configuration phase for such included moc files and if it finds them, a rule is generated to run moc at build time on the accompanying header file foo.h. If a source file has the SKIP_AUTOMOC <#prop_sf:SKIP_AUTOMOC> property set, file will be ignored by this macro.

TARGET

If specified, the INTERFACE_INCLUDE_DIRECTORIES and INTERFACE_COMPILE_DEFINITIONS target properties from the <target> are passed to moc.

qt4_use_modules

Deprecated since version 2.8.11: Use target_link_libraries() <#command:target_link_libraries> with Imported Targets <#imported-targets> instead.

Provides Qt modules to a project for linking them to a target:

```
qt4_use_modules(<target> [<LINK_PUBLIC|LINK_PRIVATE>] <modules>...)
```

This function makes <target> use the <modules> from Qt. Using a Qt module means to link to the library, add the relevant include directories for the module, and add the relevant compiler defines for using the module. Modules are roughly equivalent to Qt4 components.

LINK_PUBLIC or LINK_PRIVATE

Optional linking mode, used as the corresponding argument in the target_link_libraries() call.

For example, calling qt4_use_modules(myexe Core Gui Declarative) will use the QtCore, QtGui and QtDeclarative components on the project target myexe.

### Deprecated Variables
The following variables are provided for backward compatibility:

QT4_FOUND

Deprecated since version 2.8.11: Use Qt4_FOUND, which has the same value.

### Examples
Typical usage to find Qt4, could be something like:

```
set(CMAKE_AUTOMOC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
find_package(Qt4 4.4.3 REQUIRED QtGui QtXml)
add_executable(myexe main.cpp)
target_link_libraries(myexe PRIVATE Qt4::QtGui Qt4::QtXml)
```

### FindQuickTime
Finds the QuickTime multimedia framework, which provides support for video, audio, and interactive media:

```
find_package(QuickTime [...])
```

Note:

This module is for the QuickTime framework, which has been deprecated by Apple and is no longer supported. On Apple systems, use AVFoundation and AVKit instead.

### Result Variables
This module defines the following variables:

QuickTime_FOUND

Added in version 3.3.

Boolean indicating whether QuickTime was found.

### Cache Variables
The following cache variables may also be set:

QUICKTIME_LIBRARY

The path to the QuickTime library.

QUICKTIME_INCLUDE_DIR

Directory containing QuickTime headers.

### Hints
This module accepts the following variables:

QUICKTIME_DIR

Environment variable that can be set to help locate a QuickTime library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing QuickTime library: ./configure --prefix=$QUICKTIME_DIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

QUICKTIME_FOUND

Deprecated since version 4.2: Use QuickTime_FOUND, which has the same value.

Boolean indicating whether QuickTime was found.

### Examples
Finding QuickTime library and creating an imported interface target for linking it to a project target:

```
find_package(QuickTime)
if(QuickTime_FOUND AND NOT TARGET QuickTime::QuickTime)

  add_library(QuickTime::QuickTime INTERFACE IMPORTED)

  set_target_properties(

    QuickTime::QuickTime

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${QUICKTIME_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${QUICKTIME_LIBRARY}"

  )
endif()
target_link_libraries(example PRIVATE QuickTime::QuickTime)
```

### FindRTI
Finds HLA RTI standard libraries and their include directories:

```
find_package(RTI [...])
```

RTI <https://en.wikipedia.org/wiki/Run-time_infrastructure_(simulation)> (Run-Time Infrastructure) is a simulation infrastructure standardized by IEEE and SISO, required when implementing HLA (High Level Architecture). It provides a well-defined C++ API, ensuring that M&S (Modeling and Simulation) applications remain independent of a particular RTI implementation.

### Result Variables
This module defines the following variables:

RTI_FOUND

Boolean indicating whether HLA RTI was found.

RTI_LIBRARIES

The libraries to link against to use RTI.

RTI_DEFINITIONS

Compile definitions for using RTI. Default value is set to -DRTI_USES_STD_FSTREAM.

### Cache Variables
The following cache variables may also be set:

RTI_INCLUDE_DIR

Directory where RTI include files are found.

### Examples
Finding RTI and creating an imported interface target for linking it to a project target:

```
find_package(RTI)
if(RTI_FOUND AND NOT TARGET RTI::RTI)

  add_library(RTI::RTI INTERFACE IMPORTED)

  set_target_properties(

    RTI::RTI

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${RTI_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${RTI_LIBRARIES}"

      INTERFACE_COMPILE_DEFINITIONS "${RTI_DEFINITIONS}"

  )
endif()
target_link_libraries(example PRIVATE RTI::RTI)
```

### FindRuby
Finds Ruby installation and the locations of its include files and libraries:

```
find_package(Ruby [<version>] [COMPONENTS <components>...] [...])
```

Ruby is a general-purpose programming language. This module supports Ruby 2.0 through 4.0. Virtual environments, such as RVM or RBENV, are also supported.

### Components
Added in version 4.3.

This module supports the following components:

Interpreter

The Ruby interpreter executable.

Development

Headers and libraries needed to build Ruby extensions or embed Ruby.

If no components are specified, both Interpreter and Development are searched for.

### Imported Targets
Added in version 4.3.

This module defines the following IMPORTED <#prop_tgt:IMPORTED> targets:

Ruby::Interpreter

Ruby interpreter. Target defined if component Interpreter is found.

Ruby::Ruby

Ruby library for embedding Ruby in C/C++ applications. Target defined if component Development is found.

Ruby::Module

Ruby library for building Ruby extension modules. Target defined if component Development is found. Use this target when creating native extensions that will be loaded into Ruby via require. On most platforms, extension modules do not link directly to libruby. Includes appropriate symbol visibility settings.

### Result Variables
This module defines the following variables:

Ruby_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) ruby was found.

Ruby_VERSION

The version of ruby which was found, e.g. 3.2.6.

Ruby_VERSION_MAJOR

Ruby major version.

Ruby_VERSION_MINOR

Ruby minor version.

Ruby_VERSION_PATCH

Ruby patch version.

Ruby_EXECUTABLE

The full path to the ruby binary.

Ruby_INCLUDE_DIRS

Include dirs to be used when using the ruby library.

Ruby_LIBRARIES

Added in version 3.18.

Libraries needed to use ruby from C.

Changed in version 3.18: Previous versions of CMake used the RUBY_ prefix for all variables.

### Hints
This module accepts the following variables:

Ruby_FIND_VIRTUALENV

Added in version 3.18.

This variable defines the handling of virtual environments. It can be left empty or be set to one of the following values:

•

FIRST: Virtual Ruby environments are searched for first,

then the system Ruby installation. This is the default.

- ONLY: Only virtual environments are searched

- STANDARD: Only the system Ruby installation is searched.

Virtual environments may be provided by:

rvm

Requires that the MY_RUBY_HOME environment is defined.

rbenv

Requires that rbenv is installed in ~/.rbenv/bin or that the RBENV_ROOT environment variable is defined.

### Deprecated Variables
The following variables are provided for backward compatibility:

Deprecated since version 4.0: The following variables are deprecated. See policy CMP0185 <#policy:CMP0185>.

RUBY_FOUND

Same as Ruby_FOUND.

RUBY_VERSION

Same as Ruby_VERSION.

RUBY_EXECUTABLE

Same as Ruby_EXECUTABLE.

RUBY_INCLUDE_DIRS

Same as Ruby_INCLUDE_DIRS.

RUBY_INCLUDE_PATH

Same as Ruby_INCLUDE_DIRS.

RUBY_LIBRARY

Same as Ruby_LIBRARY.

### Examples
Finding Ruby and specifying the minimum required version:

```
find_package(Ruby 3.2.6 EXACT REQUIRED)
# or
find_package(Ruby 3.2)
```

### FindSDL
Finds the SDL (Simple DirectMedia Layer) library:

```
find_package(SDL [<version>] [...])
```

SDL is a cross-platform library for developing multimedia software, such as games and emulators.

Note:

This module is specifically intended for SDL version 1. Starting with version 2, SDL provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2). Similarly, SDL version 3 can be found using find_package(SDL3). These newer versions provide separate Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the official SDL documentation for more information.

Note that the include path for the SDL header has changed in recent SDL 1 versions from SDL/SDL.h to simply SDL.h. This change aligns with SDL's convention of using #include "SDL.h" for portability, as not all systems install the headers in a SDL/ subdirectory (e.g., FreeBSD).

When targeting macOS and using the SDL framework, be sure to include both SDLmain.h and SDLmain.m in the project. For other platforms, the SDLmain library is typically linked using -lSDLmain, which this module will attempt to locate automatically. Additionally, for macOS, this module will add the -framework Cocoa flag as needed.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

SDL::SDL

Added in version 3.19.

Target encapsulating the SDL library usage requirements, available if SDL is found.

### Result Variables
This module defines the following variables:

SDL_FOUND

Boolean indicating whether (the requested version of) SDL was found.

SDL_VERSION

Added in version 3.19.

The human-readable string containing the version of SDL found.

SDL_VERSION_MAJOR

Added in version 3.19.

The major version of SDL found.

SDL_VERSION_MINOR

Added in version 3.19.

The minor version of SDL found.

SDL_VERSION_PATCH

Added in version 3.19.

The patch version of SDL found.

SDL_INCLUDE_DIRS

Added in version 3.19.

Include directories needed to use SDL.

SDL_LIBRARIES

Added in version 3.19.

Libraries needed to link against to use SDL.

### Cache Variables
These variables may optionally be set to help this module find the correct files:

SDL_INCLUDE_DIR

The directory containing the SDL.h header file.

SDL_LIBRARY

A list of libraries containing the path to the SDL library and libraries needed to link against to use SDL.

### Hints
This module accepts the following variables:

SDL_BUILDING_LIBRARY

When set to boolean true, the SDL_main library will be excluded from linking, as it is not required when building the SDL library itself (only applications need main() function). If not set, this module assumes an application is being built and attempts to locate and include the appropriate SDL_main link flags in the returned SDL_LIBRARY variable.

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR. On macOS, setting this variable will prefer the Framework version (if found) over others. In this case, the cache value of SDL_LIBRARY would need to be manually changed to override this selection or set the CMAKE_INCLUDE_PATH <#variable:CMAKE_INCLUDE_PATH> variable to modify the search paths.

### Troubleshooting
In case the SDL library is not found automatically, the SDL_LIBRARY_TEMP variable may be empty, and SDL_LIBRARY will not be set. This typically means that CMake could not locate the SDL library (e.g., SDL.dll, libSDL.so, SDL.framework, etc.). To resolve this, manually set SDL_LIBRARY_TEMP to the correct path and reconfigure the project. Similarly, if SDLMAIN_LIBRARY is unset, it may also need to be specified manually. These variables are used to construct the final SDL_LIBRARY value. If they are not set, SDL_LIBRARY will remain undefined.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_VERSION_STRING

Deprecated since version 3.19: Superseded by the SDL_VERSION with the same value.

The human-readable string containing the version of SDL if found.

### Examples
Finding SDL library and linking it to a project target:

```
find_package(SDL)
target_link_libraries(project_target PRIVATE SDL::SDL)
```

When working with SDL version 2, the upstream package provides the SDL2::SDL2 imported target directly. It can be used in a project without using this module:

```
find_package(SDL2)
target_link_libraries(project_target PRIVATE SDL2::SDL2)
```

Similarly, for SDL version 3:

```
find_package(SDL3)
target_link_libraries(project_target PRIVATE SDL3::SDL3)
```

### See Also

- The FindSDL_gfx <#module:FindSDL_gfx> module to find the SDL_gfx library.

- The FindSDL_image <#module:FindSDL_image> module to find the SDL_image library.

- The FindSDL_mixer <#module:FindSDL_mixer> module to find the SDL_mixer library.

- The FindSDL_net <#module:FindSDL_net> module to find the SDL_net library.

- The FindSDL_sound <#module:FindSDL_sound> module to find the SDL_sound library.

- The FindSDL_ttf <#module:FindSDL_ttf> module to find the SDL_ttf library.

### FindSDL_gfx
Added in version 3.25.

Finds the SDL_gfx library that provides graphics support in SDL (Simple DirectMedia Layer) applications:

```
find_package(SDL_gfx [<version>] [...])
```

Note:

This module is for SDL_gfx version 1. For version 2 or newer usage refer to the upstream documentation.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

SDL::SDL_gfx

Target encapsulating the SDL_gfx library usage requirements, available if SDL_gfx is found.

### Result Variables
This module defines the following variables:

SDL_gfx_FOUND

Boolean indicating whether the (requested version of) SDL_gfx library was found.

SDL_gfx_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_gfx found.

### Cache Variables
The following cache variables may also be set:

SDL_GFX_INCLUDE_DIRS

The directory containing the headers needed to use SDL_gfx.

SDL_GFX_LIBRARIES

The path to the SDL_gfx library needed to link against to use SDL_gfx.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_GFX_FOUND

Deprecated since version 4.2: Use SDL_gfx_FOUND, which has the same value.

Boolean indicating whether the (requested version of) SDL_gfx library was found.

SDL_GFX_VERSION_STRING

Deprecated since version 4.2: Use the SDL_gfx_VERSION.

The human-readable string containing the version of SDL_gfx found.

### Examples
Finding SDL_gfx library and linking it to a project target:

```
find_package(SDL_gfx)
target_link_libraries(project_target PRIVATE SDL::SDL_gfx)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSDL_image
Finds the SDL_image library that loads images of various formats as SDL (Simple DirectMedia Layer) surfaces:

```
find_package(SDL_image [<version>] [...])
```

Note:

This module is specifically intended for SDL_image version 1. Starting with version 2.6, SDL_image provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2_image). Similarly, SDL_image version 3 can be found using find_package(SDL3_image). These newer versions provide Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the official SDL documentation for more information.

### Result Variables
This module defines the following variables:

SDL_image_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) SDL_image library was found.

SDL_image_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_image found.

SDL_IMAGE_INCLUDE_DIRS

Include directories containing headers needed to use the SDL_image library.

SDL_IMAGE_LIBRARIES

Libraries needed to link against to use the SDL_image library.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_IMAGE_VERSION_STRING

Deprecated since version 4.2: Use SDL_image_VERSION, which has the same value.

The human-readable string containing the version of SDL_image found.

SDL_IMAGE_FOUND

Deprecated since version 4.2: Use SDL_image_FOUND, which has the same value.

SDLIMAGE_FOUND

Deprecated since version 2.8.10: Use SDL_image_FOUND, which has the same value.

SDLIMAGE_INCLUDE_DIR

Deprecated since version 2.8.10: Use SDL_IMAGE_INCLUDE_DIRS, which has the same value.

SDLIMAGE_LIBRARY

Deprecated since version 2.8.10: Use SDL_IMAGE_LIBRARIES, which has the same value.

### Examples
Finding SDL_image library and creating an imported interface target for linking it to a project target:

```
find_package(SDL_image)
if(SDL_image_FOUND AND NOT TARGET SDL::SDL_image)

  add_library(SDL::SDL_image INTERFACE IMPORTED)

  set_target_properties(

    SDL::SDL_image

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${SDL_IMAGE_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${SDL_IMAGE_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE SDL::SDL_image)
```

When working with SDL_image version 2, the upstream package provides the SDL2_image::SDL2_image imported target directly. It can be used in a project without using this module:

```
find_package(SDL2_image)
target_link_libraries(project_target PRIVATE SDL2_image::SDL2_image)
```

Similarly, for SDL_image version 3:

```
find_package(SDL3_image)
target_link_libraries(project_target PRIVATE SDL3_image::SDL3_image)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSDL_mixer
Finds the SDL_mixer library that provides an audio mixer with support for various file formats in SDL (Simple DirectMedia Layer) applications:

```
find_package(SDL_mixer [<version>] [...])
```

Note:

This module is specifically intended for SDL_mixer version 1. Starting with version 2.5, SDL_mixer provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2_mixer). These newer versions provide Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the official SDL documentation for more information.

### Result Variables
This module defines the following variables:

SDL_mixer_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) SDL_mixer library was found.

SDL_mixer_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_mixer found.

SDL_MIXER_INCLUDE_DIRS

Include directories containing headers needed to use the SDL_mixer library.

SDL_MIXER_LIBRARIES

Libraries needed to link against to use SDL_mixer.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_MIXER_VERSION_STRING

Deprecated since version 4.2: Use SDL_mixer_VERSION, which has the same value.

The human-readable string containing the version of SDL_mixer found.

SDL_MIXER_FOUND

Deprecated since version 4.2: Use SDL_mixer_FOUND, which has the same value.

SDLMIXER_FOUND

Deprecated since version 2.8.10: Use SDL_mixer_FOUND, which has the same value.

SDLMIXER_INCLUDE_DIR

Deprecated since version 2.8.10: Use SDL_MIXER_INCLUDE_DIRS, which has the same value.

SDLMIXER_LIBRARY

Deprecated since version 2.8.10: Use SDL_MIXER_LIBRARIES, which has the same value.

### Examples
Finding SDL_mixer library and creating an imported interface target for linking it to a project target:

```
find_package(SDL_mixer)
if(SDL_mixer_FOUND AND NOT TARGET SDL::SDL_mixer)

  add_library(SDL::SDL_mixer INTERFACE IMPORTED)

  set_target_properties(

    SDL::SDL_mixer

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${SDL_MIXER_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${SDL_MIXER_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE SDL::SDL_mixer)
```

When working with SDL_mixer version 2, the upstream package provides the SDL2_mixer::SDL2_mixer imported target directly. It can be used in a project without using this module:

```
find_package(SDL2_mixer)
target_link_libraries(project_target PRIVATE SDL2_mixer::SDL2_mixer)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSDL_net
Finds the SDL_net library, a cross-platform network library for use with the SDL (Simple DirectMedia Layer) applications:

```
find_package(SDL_net [<version>] [...])
```

Note:

This module is specifically intended for SDL_net version 1. Starting with version 2.1, SDL_net provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2_net). These newer versions provide Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the official SDL documentation for more information.

### Result Variables
This module defines the following variables:

SDL_net_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) SDL_net library was found.

SDL_net_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_net found.

SDL_NET_INCLUDE_DIRS

Include directories containing headers needed to use the SDL_net library.

SDL_NET_LIBRARIES

Libraries needed to link against to use the SDL_net library.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_NET_VERSION_STRING

Deprecated since version 4.2: Use SDL_net_VERSION, which has the same value.

The human-readable string containing the version of SDL_net found.

SDL_NET_FOUND

Deprecated since version 4.2: Use SDL_net_FOUND, which has the same value.

SDLNET_FOUND

Deprecated since version 2.8.10: Use SDL_net_FOUND, which has the same value.

SDLNET_INCLUDE_DIR

Deprecated since version 2.8.10: Use SDL_NET_INCLUDE_DIRS, which has the same value.

SDLNET_LIBRARY

Deprecated since version 2.8.10: Use SDL_NET_LIBRARIES, which has the same value.

### Examples
Finding SDL_net library and creating an imported interface target for linking it to a project target:

```
find_package(SDL_net)
if(SDL_net_FOUND AND NOT TARGET SDL::SDL_net)

  add_library(SDL::SDL_net INTERFACE IMPORTED)

  set_target_properties(

    SDL::SDL_net

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${SDL_NET_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${SDL_NET_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE SDL::SDL_net)
```

When working with SDL_net version 2, the upstream package provides the SDL2_net::SDL2_net imported target directly. It can be used in a project without using this module:

```
find_package(SDL2_net)
target_link_libraries(project_target PRIVATE SDL2_net::SDL2_net)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSDL_sound
Finds the SDL_sound library, an abstract soundfile decoder for use in SDL (Simple DirectMedia Layer) applications:

```
find_package(SDL_sound [<version>] [...])
```

Note:

This module is specifically intended for SDL_sound version 1. Starting with version 2.0.2, SDL_sound provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2_sound). These newer versions provide Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the upstream SDL_sound documentation for more information.

Note:

This module depends on SDL being found and must be called after the find_package(SDL) <#module:FindSDL>. Depending on how the SDL_sound library is built, it may require additional dependent libraries to be found for this module to succeed. These dependencies may include MikMod, ModPlug, Ogg, Vorbis, SMPEG, FLAC, and Speex.

### Result Variables
This module defines the following variables:

SDL_sound_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) SDL_sound library was found.

SDL_sound_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_sound found.

SDL_SOUND_LIBRARIES

Libraries needed to link against to use the SDL_sound library.

### Cache Variables
The following cache variables may also be set:

SDL_SOUND_INCLUDE_DIR

The directory containing the SDL_sound.h and other headers needed to use the SDL_sound library.

SDL_SOUND_LIBRARY

The name of just the SDL_sound library you would link against. Use SDL_SOUND_LIBRARIES for the link instructions and not this one.

MIKMOD_LIBRARY

The path to the dependent MikMod library.

MODPLUG_LIBRARY

The path to the dependent ModPlug library (libmodplug).

OGG_LIBRARY

The path to the dependent Ogg library.

VORBIS_LIBRARY

The path to the dependent Vorbis library.

SMPEG_LIBRARY

The path to the dependent SMPEG library.

FLAC_LIBRARY

The path to the dependent FLAC library.

SPEEX_LIBRARY

The path to the dependent Speex library.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR. On macOS, setting this variable will prefer the Framework version (if found) over others. In this case, the cache value of SDL_LIBRARY would need to be manually changed to override this selection or set the CMAKE_INCLUDE_PATH <#variable:CMAKE_INCLUDE_PATH> variable to modify the search paths.

SDLSOUNDDIR

Environment variable that works the same as SDLDIR.

SDL_SOUND_EXTRAS

This is an optional cache variable that can be used to add additional flags that are prepended to the SDL_SOUND_LIBRARIES result variable. This is available mostly for cases this module failed to anticipate for and additional flags must be added.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_SOUND_FOUND

Deprecated since version 4.2: Use SDL_sound_FOUND, which has the same value.

Boolean indicating whether the (requested version of) SDL_sound library was found.

SDL_SOUND_VERSION_STRING

Deprecated since version 4.2: Use SDL_sound_VERSION, which has the same value.

The human-readable string containing the version of SDL_sound found.

### Examples
Finding SDL_sound library and creating an imported interface target for linking it to a project target:

```
find_package(SDL)
find_package(SDL_sound)
if(SDL_sound_FOUND AND NOT TARGET SDL::SDL_sound)

  add_library(SDL::SDL_sound INTERFACE IMPORTED)

  set_target_properties(

    SDL::SDL_sound

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${SDL_SOUND_INCLUDE_DIR}"

      INTERFACE_LINK_LIBRARIES "${SDL_SOUND_LIBRARIES}"

  )

  # Append the SDL dependency as imported target to be transitively linked:

  set_property(

    TARGET SDL::SDL_sound

    APPEND

    PROPERTY INTERFACE_LINK_LIBRARIES SDL::SDL

  )
endif()
target_link_libraries(project_target PRIVATE SDL::SDL_sound)
```

When working with SDL_sound version 2, the upstream package provides the SDL2_sound::SDL2_sound imported target directly. It can be used in a project without using this module:

```
find_package(SDL2_sound)
target_link_libraries(project_target PRIVATE SDL2_sound::SDL2_sound)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSDL_ttf
Finds the SDL_ttf library that provides support for rendering text with TrueType fonts in SDL (Simple DirectMedia Layer) applications:

```
find_package(SDL_ttf [<version>] [...])
```

Note:

This module is specifically intended for SDL_ttf version 1. Starting with version 2.0.15, SDL_ttf provides a CMake package configuration file when built with CMake and should be found using find_package(SDL2_ttf). Similarly, SDL_ttf version 3 can be found using find_package(SDL3_ttf). These newer versions provide Imported Targets <#imported-targets> that encapsulate usage requirements. Refer to the official SDL documentation for more information.

### Result Variables
This module defines the following variables:

SDL_ttf_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) SDL_ttf library was found.

SDL_ttf_VERSION

Added in version 4.2.

The human-readable string containing the version of SDL_ttf found.

SDL_TTF_INCLUDE_DIRS

Include directories containing headers needed to use SDL_ttf library.

SDL_TTF_LIBRARIES

Libraries needed to link against to use SDL_ttf.

### Hints
This module accepts the following variables:

SDLDIR

Environment variable that can be set to help locate an SDL library installed in a custom location. It should point to the installation destination that was used when configuring, building, and installing SDL library: ./configure --prefix=$SDLDIR.

### Deprecated Variables
The following variables are provided for backward compatibility:

SDL_TTF_VERSION_STRING

Deprecated since version 4.2: Use SDL_ttf_VERSION, which has the same value.

The human-readable string containing the version of SDL_ttf found.

SDL_TTF_FOUND

Deprecated since version 4.2: Use SDL_ttf_FOUND, which has the same value.

SDLTTF_FOUND

Deprecated since version 2.8.10: Replaced with SDL_ttf_FOUND, which has the same value.

SDLTTF_INCLUDE_DIR

Deprecated since version 2.8.10: Replaced with SDL_TTF_INCLUDE_DIRS, which has the same value.

SDLTTF_LIBRARY

Deprecated since version 2.8.10: Replaced with SDL_TTF_LIBRARIES, which has the same value.

### Examples
Finding SDL_ttf library and creating an imported interface target for linking it to a project target:

```
find_package(SDL_ttf)
if(SDL_ttf_FOUND AND NOT TARGET SDL::SDL_ttf)

  add_library(SDL::SDL_ttf INTERFACE IMPORTED)

  set_target_properties(

    SDL::SDL_ttf

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${SDL_TTF_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${SDL_TTF_LIBRARIES}"

  )
endif()
target_link_libraries(project_target PRIVATE SDL::SDL_ttf)
```

When working with SDL_ttf version 2, the upstream package provides the SDL2_ttf::SDL2_ttf imported target directly. It can be used in a project without using this module:

```
find_package(SDL2_ttf)
target_link_libraries(project_target PRIVATE SDL2_ttf::SDL2_ttf)
```

Similarly, for SDL_ttf version 3:

```
find_package(SDL3_ttf)
target_link_libraries(project_target PRIVATE SDL3_ttf::SDL3_ttf)
```

### See Also
•

The FindSDL <#module:FindSDL> module to find the main SDL library.

### FindSelfPackers
Finds UPX <https://upx.github.io/>, the Ultimate Packer for eXecutables:

```
find_package(SelfPackers [...])
```

This module searches for executable packers-tools that compress executables or shared libraries into on-the-fly, self-extracting versions. It currently supports UPX.

### Result Variables
This module defines the following variables:

SelfPackers_FOUND

Added in version 4.2.

Boolean indicating whether packer tools were found.

### Cache Variables
The following cache variables may also be set:

SELF_PACKER_FOR_EXECUTABLE

Path to the executable packer for compressing executables.

SELF_PACKER_FOR_SHARED_LIB

Path to the executable packer for compressing shared libraries.

SELF_PACKER_FOR_EXECUTABLE_FLAGS

Command-line options to use when compressing executables.

SELF_PACKER_FOR_SHARED_LIB_FLAGS

Command-line options to use when compressing shared libraries.

### Examples
Finding UPX:

```
find_package(SelfPackers)
```

### FindSQLite3
Added in version 3.14.

Finds the SQLite 3 library:

```
find_package(SQLite3 [<version>] [...])
```

SQLite is a small, fast, self-contained, high-reliability, and full-featured SQL database engine written in C, intended for embedding in applications.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

SQLite3::SQLite3

Target encapsulating SQLite library usage requirements. It is available only when SQLite is found. Added in version 4.3.

SQLite::SQLite3

Deprecated. Identical to SQLite3::SQLite3. If your project needs to support CMake < 4.3, consider adding the following to your project after calling find_package(SQLite3 ...):

```
if(NOT TARGET SQLite3::SQLite3) # CMake < 4.3

  add_library(SQLite3::SQLite3 ALIAS SQLite::SQLite3)
endif()
```

This will allow your project to use the new name while still permitting it to compile with older versions of CMake.

### Result Variables
This module defines the following variables:

SQLite3_FOUND

Boolean indicating whether the (requested version of) SQLite library was found.

SQLite3_VERSION

The version of SQLite library found.

SQLite3_INCLUDE_DIRS

Include directories containing the <sqlite3.h> and related headers needed to use SQLite.

SQLite3_LIBRARIES

Libraries needed to link against to use SQLite.

### Examples
Finding the SQLite library and linking it to a project target:

```
find_package(SQLite3)
target_link_libraries(project_target PRIVATE SQLite3::SQLite3)
```

### FindSquish
Finds Squish, a cross-platform automated GUI testing framework for applications built on various GUI technologies:

```
find_package(Squish [<version>] [...])
```

Squish supports testing of both native and cross-platform toolkits, such as Qt, Java, and Tk.

### Result Variables
This module defines the following variables:

Squish_FOUND

Added in version 3.3.

Boolean indicating whether (the requested version of) Squish was found.

Squish_VERSION

Added in version 4.2.

The full version of the Squish found.

SQUISH_INSTALL_DIR_FOUND

Boolean indicating whether the Squish installation directory was found.

SQUISH_SERVER_EXECUTABLE_FOUND

Boolean indicating whether the Squish server executable was found.

SQUISH_CLIENT_EXECUTABLE_FOUND

Boolean indicating whether the Squish client executable was found.

### Cache Variables
The following cache variables may also be set:

SQUISH_INSTALL_DIR

The Squish installation directory containing bin, lib, etc.

SQUISH_SERVER_EXECUTABLE

The path to the squishserver executable.

SQUISH_CLIENT_EXECUTABLE

The path to the squishrunner executable.

### Commands
This module provides the following commands, if Squish is found:

squish_add_test

Adds a Squish test to the project:

```
squish_add_test(

  <name>

  AUT <target>

  SUITE <suite-name>

  TEST <squish-test-case-name>

  [PRE_COMMAND <command>]

  [POST_COMMAND <command>]

  [SETTINGSGROUP <group>]
)
```

This command is built on top of the add_test() <#command:add_test> command and adds a Squish test called <name> to the CMake project. It supports Squish versions 4 and newer.

During the CMake testing phase, the Squish server is started, the test is executed on the client, and the server is stopped once the test completes. If any of these steps fail (including if the test itself fails), a fatal error is raised indicating the test did not pass.

The arguments are:

<name>

The name of the test. This is passed as the first argument to the add_test() <#command:add_test> command.

AUT <target>

The name of the CMake target to be used as the AUT (Application Under Test), i.e., the executable that will be tested.

SUITE <suite-name>

Either the full path to the Squish test suite or just the suite name (i.e., the last directory name of the suite). In the latter case, the CMakeLists.txt invoking squish_add_test() must reside in the parent directory of the suite.

TEST <squish-test-case-name>

The name of the Squish test, corresponding to the subdirectory of the test within the suite directory.

PRE_COMMAND <command>

An optional command to execute before starting the Squish test. Pass it as a string. This may be a single command, or a semicolon-separated list <#cmake-language-lists> of command and arguments.

POST_COMMAND <command>

An optional command to execute after the Squish test has completed. Pass it as a string. This may be a single command, or a semicolon-separated list <#cmake-language-lists> of command and arguments.

SETTINGSGROUP <group>

Deprecated since version 3.18: This argument is now ignored. It was previously used to specify a settings group name for executing the test instead of the default value CTest_<username>.

Changed in version 3.18: In previous CMake versions, this command was named squish_v4_add_test().

squish_v3_add_test

Adds a Squish test to the project, when using Squish version 3.x:

```
squish_v3_add_test(

  <test-name>

  <application-under-test>

  <squish-test-case-name>

  <environment-variables>

  <test-wrapper>
)
```

Note:

This command is for Squish version 3, which is not maintained anymore. Use a newer Squish version, and squish_add_test() command.

The arguments are:

<name>

The name of the test.

<application-under-test>

The path to the executable used as the AUT (Application Under Test), i.e., the executable that will be tested.

<squish-test-case-name>

The name of the Squish test, corresponding to the subdirectory of the test within the suite directory.

<environment-variables>

A semicolon-separated list of environment variables and their values (VAR=VALUE).

<test-wrapper>

A string of one or more (semicolon-separated list) test wrappers needed by the test case.

### Deprecated Variables
The following variables are provided for backward compatibility:

SQUISH_FOUND

Deprecated since version 4.2: Use Squish_FOUND, which has the same value.

Boolean indicating whether (the requested version of) Squish was found.

SQUISH_VERSION

Deprecated since version 4.2: Superseded by the Squish_VERSION.

The full version of the Squish found.

SQUISH_VERSION_MAJOR

Deprecated since version 4.2: Superseded by the Squish_VERSION.

The major version of the Squish found.

SQUISH_VERSION_MINOR

Deprecated since version 4.2: Superseded by the Squish_VERSION.

The minor version of the Squish found.

SQUISH_VERSION_PATCH

Deprecated since version 4.2: Superseded by the Squish_VERSION.

The patch version of the Squish found.

### Examples
Finding Squish and specifying a minimum required version:

```
find_package(Squish 6.5)
```

Adding a Squish test:

```
enable_testing()
find_package(Squish 6.5)
if(Squish_FOUND)

  squish_add_test(

    projectTestName

    AUT projectApp

    SUITE ${CMAKE_CURRENT_SOURCE_DIR}/tests/projectSuite

    TEST someSquishTest

  )
endif()
```

Example, how to use the squish_v3_add_test() command:

```
enable_testing()
find_package(Squish 3.0)
if(Squish_FOUND)

  squish_v3_add_test(

    projectTestName

    $<TARGET_FILE:projectApp>

    someSquishTest

    "FOO=1;BAR=2"

    testWrapper

  )
endif()
```

### FindSubversion
Finds a Subversion command-line client executable (svn) and provides commands for extracting information from a Subversion working copy:

```
find_package(Subversion [<version>] [...])
```

### Result Variables
This module defines the following variables:

Subversion_FOUND

Boolean indicating whether the (requested version of) Subversion command-line client was found.

Subversion_VERSION

Added in version 4.2.

Version of the svn command-line client found.

### Cache Variables
The following cache variables may also be set:

Subversion_SVN_EXECUTABLE

Path to the svn command-line client.

### Commands
This module provides the following commands if the Subversion command-line client is found:

Subversion_WC_INFO

Extracts information from a Subversion working copy located at a specified directory:

```
Subversion_WC_INFO(<dir> <var-prefix> [IGNORE_SVN_FAILURE])
```

This command defines the following variables if running Subversion's info subcommand on <dir> succeeds; otherwise a SEND_ERROR message is generated:

<var-prefix>_WC_URL

URL of the repository (at <dir>).

<var-prefix>_WC_ROOT

Root URL of the repository.

<var-prefix>_WC_REVISION

Current revision.

<var-prefix>_WC_LAST_CHANGED_AUTHOR

Author of last commit.

<var-prefix>_WC_LAST_CHANGED_DATE

Date of last commit.

<var-prefix>_WC_LAST_CHANGED_REV

Revision of last commit.

<var-prefix>_WC_INFO

Output of the command svn info <dir>

The options are:

IGNORE_SVN_FAILURE

Added in version 3.13.

When specified, errors from Subversion operation will not trigger a SEND_ERROR message. In case of an error, the <var-prefix>_* variables remain undefined.

Subversion_WC_LOG

Retrieves the log message of the base revision of a Subversion working copy at a given location:

```
Subversion_WC_LOG(<dir> <var-prefix>)
```

This command defines the following variable if running Subversion's log subcommand on <dir> succeeds; otherwise a SEND_ERROR message is generated:

<var-prefix>_LAST_CHANGED_LOG

Last log of the base revision of a Subversion working copy located at <dir>.

### Deprecated Variables
The following variables are provided for backward compatibility:

SUBVERSION_FOUND

Deprecated since version 4.2: Use Subversion_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Subversion command-line client was found.

Subversion_VERSION_SVN

Deprecated since version 4.2: Use the Subversion_VERSION.

Version of the svn command-line client found.

### Examples: Finding Subversion
Finding Subversion:

```
find_package(Subversion)
```

Or, finding Subversion and specifying a minimum required version:

```
find_package(Subversion 1.4)
```

Or, finding Subversion and making it required (if not found, processing stops with an error message):

```
find_package(Subversion REQUIRED)
```

### Example: Using Subversion
Finding Subversion and retrieving information about the current project's working copy:

```
find_package(Subversion)
if(Subversion_FOUND)

  Subversion_WC_INFO(${PROJECT_SOURCE_DIR} Project)

  message("Current revision is ${Project_WC_REVISION}")

  Subversion_WC_LOG(${PROJECT_SOURCE_DIR} Project)

  message("Last changed log is ${Project_LAST_CHANGED_LOG}")
endif()
```

### FindSWIG
Finds the installed Simplified Wrapper and Interface Generator (SWIG <https://swig.org>) executable and determines its version:

```
find_package(SWIG [<version>] [COMPONENTS <langs>...] [...])
```

Added in version 3.19: Support for specifying version range when calling the find_package() <#command:find_package> command. When a version is requested, it can be specified as a single value as before, and now also a version range can be used. For a detailed description of version range usage and capabilities, refer to the find_package() <#command:find_package> command.

### Components
Added in version 3.18.

This module supports optional components to specify target languages.

If a COMPONENTS or OPTIONAL_COMPONENTS argument is given to the find_package() <#command:find_package> command, it will also determine supported target languages.

```
find_package(SWIG [COMPONENTS <langs>...] [OPTIONAL_COMPONENTS <langs>...])
```

Any COMPONENTS given to find_package() should be the names of supported target languages as provided to the LANGUAGE argument of swig_add_library() <#command:swig_add_library>, such as python or perl5. Language names must be lowercase.

### Result Variables
This module defines the following variables:

SWIG_FOUND

Boolean indicating whether (the requested version of) SWIG and any required components were found on the system.

SWIG_VERSION

SWIG executable version (result of swig -version).

SWIG_<lang>_FOUND

If COMPONENTS or OPTIONAL_COMPONENTS are requested, each available target language <lang> (lowercase) will be set to TRUE.

SWIG_DIR

Path to the installed SWIG Lib directory (result of swig -swiglib).

### Cache Variables
The following cache variables may also be set:

SWIG_EXECUTABLE

The path to the SWIG executable. This executable is used to retrieve all information for this module. It can be also manually set to change the version to be found from the command line.

### Examples
Example usage requiring SWIG 4.0 or higher and Python language support, with optional Fortran support:

```
find_package(SWIG 4.0 COMPONENTS python OPTIONAL_COMPONENTS fortran)
if(SWIG_FOUND)

  message("SWIG found: ${SWIG_EXECUTABLE}")

  if(NOT SWIG_fortran_FOUND)

    message(WARNING "SWIG Fortran bindings cannot be generated")

  endif()
endif()
```

This module is commonly used in conjunction with the UseSWIG <#module:UseSWIG> module:

```
find_package(SWIG COMPONENTS python)
if(SWIG_FOUND)

  include(UseSWIG)

  swig_add_library(mymod LANGUAGE python SOURCES mymod.i)
endif()
```

### See Also
•

The UseSWIG <#module:UseSWIG> module to use SWIG in CMake.

### FindTCL
Finds the Tcl (Tool Command Language), dynamic programming language:

```
find_package(TCL [...])
```

This module locates a Tcl installation, including its include directories and libraries, and determines the appropriate Tcl library name for linking. As part of the Tcl ecosystem, it also finds Tk, a GUI toolkit that provides a library of basic widgets for building graphical user interfaces.

### Result Variables
This module defines the following variables:

TCL_FOUND

Boolean indicating whether Tcl was found.

TK_FOUND

Boolean indicating whether Tk was found.

TCLTK_FOUND

Boolean indicating whether both Tcl and Tk were found.

### Cache Variables
The following cache variables may also be set:

TCL_LIBRARY

The path to the Tcl library (e.g., tcl, etc.).

TCL_INCLUDE_PATH

The directory containing tcl.h and other Tcl-related headers needed to use Tcl.

TCL_TCLSH

The path to the tclsh command-line executable.

TK_LIBRARY

The path to the Tk library (e.g., tk, etc.).

TK_INCLUDE_PATH

The directory containing tk.h and other Tk-related headers needed to use Tk.

TK_WISH

The path to the wish windowing shell command-line executable.

### Other Libraries
The Tcl Stub Library can be found using the separate FindTclStub <#module:FindTclStub> module.

### Examples
Finding Tcl:

```
find_package(TCL)
```

### See Also

- The FindTclsh <#module:FindTclsh> module to find the Tcl shell command-line executable.

- The FindTclStub <#module:FindTclStub> module to find the Tcl Stubs Library.

- The FindWish <#module:FindWish> module to find the wish windowing shell command-line executable .

### FindTclsh
Finds the Tcl shell command-line executable (tclsh), which includes the Tcl (Tool Command Language) interpreter:

```
find_package(Tclsh [<version>] [...])
```

### Result Variables
This module defines the following variables:

Tclsh_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) tclsh executable was found.

Tclsh_VERSION

Added in version 4.2.

The version of tclsh found.

### Cache Variables
The following cache variables may also be set:

TCL_TCLSH

The path to the tclsh executable.

### Deprecated Variables
The following variables are provided for backward compatibility:

TCLSH_FOUND

Deprecated since version 4.2: Use Tclsh_FOUND, which has the same value.

Boolean indicating whether the (requested version of) tclsh executable was found.

TCLSH_VERSION_STRING

Deprecated since version 4.2: Use Tclsh_VERSION, which has the same value.

The version of tclsh found.

### Examples
In the following example, this module is used to find the tclsh command-line executable, which is then executed in a process to evaluate TCL code from the script file located in the project source directory:

```
find_package(Tclsh)
if(Tclsh_FOUND)

  execute_process(COMMAND ${TCL_TCLSH} example-script.tcl)
endif()
```

### See Also

- The FindTCL <#module:FindTCL> module to find the Tcl installation.

- The FindTclStub <#module:FindTclStub> module to find the Tcl Stubs Library.

### FindTclStub
Finds the Tcl Stub Library, which is used for building version-independent Tcl extensions:

```
find_package(TclStub [...])
```

Tcl (Tool Command Language) is a dynamic programming language, and the Tcl Stub Library provides a mechanism to allow Tcl extensions to be compiled in a way that they can work across multiple Tcl versions, without requiring recompilation.

This module is typically used in conjunction with Tcl development projects that aim to be portable across different Tcl releases. It first calls the FindTCL <#module:FindTCL> module to locate Tcl installation and then attempts to find the stub libraries corresponding to the located Tcl version.

### Result Variables
This module defines the following variables:

TclStub_FOUND

Added in version 4.2.

Boolean indicating whether the Tcl Stub Library was found.

### Cache Variables
The following cache variables may also be set:

TCL_STUB_LIBRARY

The path to the Tcl stub library.

TK_STUB_LIBRARY

The path to the Tk stub library.

TTK_STUB_LIBRARY

The path to the ttk stub library.

### Examples
Finding Tcl Stubs Library:

```
find_package(TclStub)
```

### See Also

- The FindTCL <#module:FindTCL> module to find the Tcl installation.

- The FindTclsh <#module:FindTclsh> module to find the Tcl shell command-line executable.

Online references:

- How to Use the Tcl Stubs Library <https://www.tcl-lang.org/doc/howto/stubs.html>

- Practical Programming in Tcl and Tk <https://www.oreilly.com/library/view/practical-programming-in/0130385603/>

### FindThreads
Finds and determines the thread library of the system for multithreading support:

```
find_package(Threads [...])
```

Multithreading enables concurrent execution within a single program, typically by creating multiple threads of execution. Most commonly, this is done using libraries such as POSIX Threads (pthreads) on Unix-like systems or Windows threads on Windows.

This module abstracts the platform-specific differences and detects how to enable thread support - whether it requires linking to a specific library, adding compiler flags (like -pthread), or both. On some platforms, threading is also implicitly available in default libraries without the need to use additional flags or libraries.

This module is suitable for use in both C and C++ projects (and occasionally other compiled languages) that rely on system-level threading APIs.

Using this module ensures that project builds correctly across different platforms by handling the detection and setup of thread support in a portable way.

### C and C++ Language Standards
The C11 standard introduced a minimal cross-platform thread API via <threads.h> header file, and C++11 added <thread> header to the standard library, offering high-level multithreading support. These standard headers allow writing portable threaded code at the language level, without directly using platform-specific APIs like pthreads or Windows threads.

However, even with standard C11 or C++11 threads support available, there may still be a need for platform-specific compiler or linker flags (e.g., -pthread on Unix-like systems) for some applications. This is where FindThreads remains relevant - it ensures these flags and any required libraries are correctly set up, even if not explicitly using system APIs.

In short:

- Use <thread> (C++11 and later) or <threads.h> (C11) in source code for portability and simpler syntax.

- Use find_package(Threads) in CMake project when application needs the traditional threading support and to ensure code compiles and links correctly across different platforms.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Threads::Threads

Added in version 3.1.

Target encapsulating the usage requirements to enable threading through flags or a threading library, if found. This target is available if threads are detected as supported.

### Result Variables
This module defines the following variables:

Threads_FOUND

Boolean indicating whether Threads is supported, either through a separate library or a standard library.

CMAKE_THREAD_LIBS_INIT

The thread library to use. This may be empty if the thread functions are provided by the system libraries and no special flags are needed to use them.

CMAKE_USE_WIN32_THREADS_INIT

If the found thread library is the win32 one.

CMAKE_USE_PTHREADS_INIT

If the found thread library is pthread compatible.

CMAKE_HP_PTHREADS_INIT

If the found thread library is the HP thread library.

### Variables Affecting Behavior
This module accepts the following variables before calling find_package(Threads):

THREADS_PREFER_PTHREAD_FLAG

Added in version 3.1.

If the use of the -pthread compiler and linker flag is preferred then the caller can set this variable to boolean true. The compiler flag can only be used with the imported target. Use of both the imported target as well as this switch is highly recommended for new code.

This variable has no effect if the system libraries provide the thread functions, i.e. when CMAKE_THREAD_LIBS_INIT will be empty.

### Examples
Finding Threads and linking the imported target to a project target:

```
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package(Threads)
target_link_libraries(example PRIVATE Threads::Threads)
```

### FindTIFF
Finds the TIFF library <https://libtiff.gitlab.io/libtiff/> (libtiff):

```
find_package(TIFF [<version>] [COMPONENTS <components>...] [...])
```

This module also takes into account the upstream TIFF library's exported CMake package configuration, if available.

### Components
This module supports optional components which can be specified with:

```
find_package(TIFF [COMPONENTS <components>...])
```

Supported components include:

CXX

Added in version 3.19.

Optional component that ensures that the C++ wrapper library (libtiffxx) is found.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

TIFF::TIFF

Added in version 3.5.

Target encapsulating the TIFF library usage requirements, available only if the TIFF is found.

TIFF::CXX

Added in version 3.19.

Target encapsulating the usage requirements for the C++ wrapper library libtiffxx, available only if TIFF is found. This target provides CXX usage requirements only if the compiler is not MSVC. It also has the TIFF::TIFF target linked in to simplify its usage.

### Result Variables
This module defines the following variables:

TIFF_FOUND

Boolean indicating whether (the requested version of) TIFF is found.

TIFF_VERSION

Added in version 4.2.

The version of TIFF library found.

TIFF_INCLUDE_DIRS

The directory containing the TIFF headers.

TIFF_LIBRARIES

TIFF libraries to be linked.

### Cache Variables
The following cache variables may also be set:

TIFF_INCLUDE_DIR

The directory containing the TIFF headers.

TIFF_LIBRARY_RELEASE

Added in version 3.4.

The path to the TIFF library for release configurations.

TIFF_LIBRARY_DEBUG

Added in version 3.4.

The path to the TIFF library for debug configurations.

TIFFXX_LIBRARY_RELEASE

Added in version 3.19.

The path to the TIFFXX library for release configurations.

TIFFXX_LIBRARY_DEBUG

Added in version 3.19.

The path to the TIFFXX library for debug configurations.

### Deprecated Variables
The following variables are provided for backward compatibility:

TIFF_VERSION_STRING

Deprecated since version 4.2: Superseded by the TIFF_VERSION.

The version of TIFF library found.

### Examples
Finding TIFF library and linking it to a project target:

```
find_package(TIFF)
target_link_libraries(project_target PRIVATE TIFF::TIFF)
```

Finding TIFF and TIFFXX libraries by specifying the CXX component:

```
find_package(TIFF COMPONENTS CXX)
target_link_libraries(project_target PRIVATE TIFF::CXX)
```

### FindVulkan
Added in version 3.7.

Finds Vulkan, a low-overhead, cross-platform 3D graphics and computing API, along with related development tools typically provided by the Vulkan SDK:

```
find_package(Vulkan [<version>] [COMPONENTS <components>...] [...])
```

Vulkan includes commonly used utilities such as shader compilers and SPIR-V tools (e.g., DXC, glslc, glslang, etc.) that support Vulkan-based development workflows.

### Components
Added in version 3.24.

This module supports several optional components that can be specified with the find_package() <#command:find_package> command:

```
find_package(Vulkan [COMPONENTS <components>...])
```

Each component provides a corresponding imported target. Supported components include:

glslc

Added in version 3.24.

Finds the SPIR-V compiler. This optional component is always implied automatically for backward compatibility, even if not requested.

glslangValidator

Added in version 3.24.

Finds the glslangValidator tool that is used to compile GLSL and HLSL shaders into SPIR-V. This optional component is always implied automatically for backward compatibility, even if not requested.

glslang

Added in version 3.24.

Finds the Khronos-reference front-end shader parser and SPIR-V code generation library (glslang).

shaderc_combined

Added in version 3.24.

Finds the Google static library used for Vulkan shader compilation.

SPIRV-Tools

Added in version 3.24.

Finds Khronos library for analyzing and transforming SPIR-V modules.

MoltenVK

Added in version 3.24.

Finds the Khronos MoltenVK library, which is available on macOS, and implements a subset of Vulkan API over Apple Metal graphics framework.

dxc

Added in version 3.25.

Finds the DirectX Shader Compiler (DXC), including the library and command-line tool. Note that Visual Studio also provides a DXC tool, but the version included with the Vulkan SDK is typically required for Vulkan development, as it has Vulkan capability enabled.

volk

Added in version 3.25.

Finds the Vulkan meta-loader volk library.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

Vulkan::Vulkan

Target encapsulating the main Vulkan library usage requirements, available if Vulkan is found.

Vulkan::glslc

Added in version 3.19.

Imported executable target encapsulating the GLSLC SPIR-V compiler usage requirements, available if glslc is found.

Vulkan::Headers

Added in version 3.21.

Target encapsulating the usage requirements needed to include Vulkan headers. It provides only the include directories and does not link to any library. This is useful for applications that load the Vulkan library dynamically at runtime. This target is available if Vulkan is found.

Vulkan::glslangValidator

Added in version 3.21.

Imported executable target encapsulating the glslangValidator usage requirements, available if this tool is found.

Vulkan::glslang

Added in version 3.24.

Target encapsulating the glslang library usage requirements, available if glslang is found in the SDK.

Vulkan::shaderc_combined

Added in version 3.24.

Target encapsulating the shaderc_combined library usage requirements, available if this library is found in the SDK.

Vulkan::SPIRV-Tools

Added in version 3.24.

Target encapsulating the SPIRV-Tools library usage requirements, available if this library is found in the SDK.

Vulkan::MoltenVK

Added in version 3.24.

Target encapsulating the MoltenVK library usage requirements, available if this library is found in the SDK.

Vulkan::volk

Added in version 3.25.

Target encapsulating the volk library usage requirements, available if volk is found in the SDK.

Vulkan::dxc_lib

Added in version 3.25.

Target encapsulating the usage requirements for the DirectX shader compiler library, available if DXC library is found in the SDK.

Vulkan::dxc_exe

Added in version 3.25.

Imported executable target providing usage requirements for the DirectX shader compiler CLI tool, available if SDK has this tool.

### Result Variables
This module defines the following variables:

Vulkan_FOUND

Boolean indicating whether (the requested version of) Vulkan and all required components were found.

Vulkan_VERSION

Added in version 3.23.

The version of Vulkan found. Value is retrieved from vulkan/vulkan_core.h.

Vulkan_INCLUDE_DIRS

Include directories needed to use the main Vulkan library.

Vulkan_LIBRARIES

Libraries needed to link against to use the main Vulkan library.

Vulkan_glslc_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the glslc executable.

Vulkan_glslangValidator_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the glslangValidator executable.

Vulkan_glslang_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the glslang library.

Vulkan_shaderc_combined_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the shaderc_combined library.

Vulkan_SPIRV-Tools_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the SPIRV-Tools library.

Vulkan_MoltenVK_FOUND

Added in version 3.24.

Boolean indicating whether the SDK provides the MoltenVK library.

Vulkan_volk_FOUND

Added in version 3.25.

Boolean indicating whether the SDK provides the volk library.

Vulkan_dxc_lib_FOUND

Added in version 3.25.

Boolean indicating whether the SDK provides the DirectX shader compiler library.

Vulkan_dxc_exe_FOUND

Added in version 3.25.

Boolean indicating whether the SDK provides the DirectX shader compiler CLI tool.

### Cache Variables
The following cache variables may also be set:

Vulkan_INCLUDE_DIR

The directory containing Vulkan headers.

Vulkan_LIBRARY

The path to the Vulkan library.

Vulkan_GLSLC_EXECUTABLE

Added in version 3.19.

The path to the GLSL SPIR-V compiler.

Vulkan_GLSLANG_VALIDATOR_EXECUTABLE

Added in version 3.21.

The path to the glslangValidator tool.

Vulkan_glslang_LIBRARY

Added in version 3.24.

The path to the glslang library.

Vulkan_shaderc_combined_LIBRARY

Added in version 3.24.

The path to the shaderc_combined library.

Vulkan_SPIRV-Tools_LIBRARY

Added in version 3.24.

The path to the SPIRV-Tools library.

Vulkan_MoltenVK_LIBRARY

Added in version 3.24.

The path to the MoltenVK library.

Vulkan_volk_LIBRARY

Added in version 3.25.

The path to the volk library.

Vulkan_dxc_LIBRARY

Added in version 3.25.

The path to the DirectX shader compiler library.

Vulkan_dxc_EXECUTABLE

Added in version 3.25.

The path to the DirectX shader compiler CLI tool.

### Hints
This module accepts the following variables:

VULKAN_SDK

This environment variable can be optionally set to specify the location of the Vulkan SDK root directory for the given architecture. It is typically set by sourcing the toplevel setup-env.sh script of the Vulkan SDK directory into the shell environment.

### Examples
Finding the Vulkan library and linking it to a project target:

```
find_package(Vulkan)
target_link_libraries(project_target PRIVATE Vulkan::Vulkan)
```

Finding the Vulkan library along with additional components:

```
find_package(Vulkan COMPONENTS volk)
target_link_libraries(project_target PRIVATE Vulkan::Vulkan Vulkan::volk)
```

### FindWget
This module finds the wget command-line tool for retrieving content from web servers:

```
find_package(Wget [...])
```

### Result Variables
This module defines the following variables:

Wget_FOUND

Added in version 3.3.

Boolean indicating whether wget was found.

### Cache Variables
The following cache variables may also be set:

WGET_EXECUTABLE

The full path to the wget tool.

### Deprecated Variables
The following variables are provided for backward compatibility:

WGET_FOUND

Deprecated since version 4.2: Use Wget_FOUND, which has the same value.

Boolean indicating whether wget was found.

### Examples
Finding wget and executing it in a process:

```
find_package(Wget)
if(Wget_FOUND)

  execute_process(COMMAND ${WGET_EXECUTABLE} -h)
endif()
```

### See Also
•

The file(DOWNLOAD) <#download> command to download the given URL to a local file.

### FindWish
Finds wish, a simple windowing shell command-line executable:

```
find_package(Wish [...])
```

This module is commonly used in conjunction with finding a TCL installation (see the FindTCL <#module:FindTCL> module). It helps determine where the TCL include paths and libraries are, as well as identifying the name of the TCL library.

If the UNIX <#variable:UNIX> variable is defined, the module will prioritize looking for the Cygwin version of wish executable.

### Result Variables
This module defines the following variables:

Wish_FOUND

Added in version 4.2.

Boolean indicating whether the wish executable was found.

### Cache Variables
The following cache variables may also be set:

TK_WISH

The path to the wish executable.

### Examples
Finding wish:

```
find_package(Wish)
message(STATUS "Found wish at: ${TK_WISH}")
```

### FindwxWidgets
Finds a wxWidgets installation and provides usage requirements for usage in projects:

```
find_package(wxWidgets [<version>] [COMPONENTS <components>...] [...])
```

wxWidgets (formerly known as wxWindows) is a widget toolkit and tools library for creating graphical user interfaces (GUIs) for cross-platform applications.

Added in version 3.4: Support for find_package() <#command:find_package> version argument.

Added in version 3.14: OPTIONAL_COMPONENTS support.

### Components
wxWidgets is a modular library. This module supports components to specify the modules to use. Components can be specified with the find_package() <#command:find_package> command:

```
find_package(

  wxWidgets

  [COMPONENTS <components>...]

  [OPTIONAL_COMPONENTS <components>...]
)
```

Supported components include:

base

Finds the library that provides mandatory classes that any wxWidgets code depends on. This component is always required for applications implementing wxWidgets.

core

Finds the library that provides basic GUI classes such as GDI classes or controls.

gl

Finds the OpenGL support.

mono

Finds the wxWidgets monolithic library.

aui

Finds the Advanced User Interface docking library.

net

Finds the library that provides network access.

webview

Added in version 3.4.

Finds the library that provides rendering of web documents (HTML/CSS/JavaScript).

For a full list of supported wxWidgets components, refer to the upstream documentation.

If no components are specified, this module by default searches for core and base components.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

wxWidgets::wxWidgets

Added in version 3.27.

An interface imported target encapsulating the wxWidgets usage requirements for the found components, available if wxWidgets is found.

### Result Variables
This module defines the following variables:

wxWidgets_FOUND

Boolean indicating whether (the requested version of) wxWidgets and all its requested components were found.

wxWidgets_VERSION

Added in version 4.2.

The version of the wxWidgets found.

wxWidgets_INCLUDE_DIRS

Include directories for WIN32, i.e., where to find <wx/wx.h> and <wx/setup.h>; possibly empty for Unix-like systems.

wxWidgets_LIBRARIES

Path to the wxWidgets libraries.

wxWidgets_LIBRARY_DIRS

Compile time link dirs, useful for setting rpath on Unix-like systems. Typically an empty string in WIN32 environment.

wxWidgets_DEFINITIONS

Contains compile definitions required to compile/link against WX, e.g. WXUSINGDLL.

wxWidgets_DEFINITIONS_DEBUG

Contains compile definitions required to compile/link against WX debug builds, e.g. __WXDEBUG__.

wxWidgets_CXX_FLAGS

Include directories and compiler flags for Unix-like systems, empty on Windows. Essentially the output of wx-config --cxxflags.

### Hints
This module accepts the following variables before calling find_package(wxWidgets):

WX_CONFIG

Added in version 3.11.

Environment variable to manually specify the name of the wxWidgets library configuration provider executable that will be searched besides the default name wx-config.

WXRC_CMD

Added in version 3.11.

Environment variable to manually specify the name of the wxWidgets resource file compiler executable that will be searched besides the default name wxrc.

There are two search branches: a Windows style and a Unix style. For Windows, the following variables are searched for and set to defaults in case of multiple choices. Change them if the defaults are not desired (i.e., these are the only variables that should be changed to select a configuration):

wxWidgets_ROOT_DIR

Base wxWidgets directory (e.g., C:/wxWidgets-3.2.0).

wxWidgets_LIB_DIR

Path to wxWidgets libraries (e.g., C:/wxWidgets-3.2.0/lib/vc_x64_lib).

wxWidgets_CONFIGURATION

Configuration to use (e.g., msw, mswd, mswu, mswunivud, etc.)

wxWidgets_EXCLUDE_COMMON_LIBRARIES

Set to TRUE to exclude linking of commonly required libs (e.g., png, tiff, jpeg, zlib, webp, regex, expat, scintilla, lexilla, etc.).

For Unix style this module uses the wx-config utility. Selecting between debug/release, unicode/ansi, universal/non-universal, and static/shared is possible in the QtDialog or ccmake interfaces by turning ON/OFF the following variables:

wxWidgets_USE_DEBUG

If enabled, the wxWidgets debug build will be searched.

wxWidgets_USE_UNICODE

If enabled, the wxWidgets unicode build will be searched.

wxWidgets_USE_UNIVERSAL

If enabled, the wxWidgets universal build will be searched.

wxWidgets_USE_STATIC

If enabled, static wxWidgets libraries will be linked.

wxWidgets_CONFIG_OPTIONS

This variable can be used for all other options that need to be passed to the wx-config utility. For example, to use the base toolkit found on the system at /usr install prefix, set the variable (before calling the find_package() <#command:find_package> command) as such:

```
set(wxWidgets_CONFIG_OPTIONS --toolkit=base --prefix=/usr)
```

### Deprecated Variables
The following variables are provided for backward compatibility:

wxWidgets_VERSION_STRING

Deprecated since version 4.2: Use wxWidgets_VERSION, which has the same value.

Added in version 3.4.

The version of the wxWidgets found.

wxWidgets_USE_FILE

Deprecated since version 4.2: Instead of using this variable, include the UsewxWidgets <#module:UsewxWidgets> module directly:

```
include(UsewxWidgets)
```

The path to the UsewxWidgets <#module:UsewxWidgets> module for using wxWidgets in the current directory. For example:

```
find_package(wxWidgets)
if(wxWidgets_FOUND)

  include(${wxWidgets_USE_FILE})
endif()
```

### Example: Finding wxWidgets
Finding wxWidgets and making it required (if wxWidgets is not found, processing stops with an error message):

```
find_package(wxWidgets REQUIRED)
```

### Example: Using Imported Target
Finding wxWidgets and using imported target in a project:

```
find_package(wxWidgets)
target_link_libraries(example PRIVATE wxWidgets::wxWidgets)
```

### Example: Using Components
Finding wxWidgets and specifying components:

```
find_package(wxWidgets COMPONENTS gl core base OPTIONAL_COMPONENTS net)
target_link_libraries(example PRIVATE wxWidgets::wxWidgets)
```

### Example: Monolithic wxWidgets Build
Sample usage with monolithic wxWidgets build:

```
find_package(wxWidgets COMPONENTS mono)
target_link_libraries(example PRIVATE wxWidgets::wxWidgets)
```

### Example: Using Variables
Finding and using wxWidgets in CMake versions prior to 3.27, when the imported target wasn't yet available:

```
# Note that for MinGW users the order of libs is important.
find_package(wxWidgets COMPONENTS gl core base OPTIONAL_COMPONENTS net)
if(wxWidgets_FOUND)

  include(UsewxWidgets)

  # and for each of the project dependent executable/library targets:

  target_link_libraries(example ${wxWidgets_LIBRARIES})
endif()
```

### FindX11
Finds the X11 installation on Unix-like systems:

```
find_package(X11 [COMPONENTS <components>...] [...])
```

### Result Variables
This module defines the following variables:

X11_FOUND

Boolean indicating whether X11 was found.

X11_<component>_FOUND

Boolean indicating whether the <component> was found.

X11_INCLUDE_DIR

Include directories needed to use X11.

X11_LIBRARIES

Libraries needed to link against to use X11.

and also the following more fine grained variables and targets:

Added in version 3.14: Imported targets.

```
X11_ICE_INCLUDE_PATH,            X11_ICE_LIB,            X11_ICE_FOUND,            X11::ICE
X11_SM_INCLUDE_PATH,             X11_SM_LIB,             X11_SM_FOUND,             X11::SM
X11_X11_INCLUDE_PATH,            X11_X11_LIB,                                      X11::X11
X11_Xaccessrules_INCLUDE_PATH,
X11_Xaccessstr_INCLUDE_PATH,                             X11_Xaccess_FOUND
X11_Xau_INCLUDE_PATH,            X11_Xau_LIB,            X11_Xau_FOUND,            X11::Xau
X11_xcb_INCLUDE_PATH,            X11_xcb_LIB,            X11_xcb_FOUND,            X11::xcb
X11_X11_xcb_INCLUDE_PATH,        X11_X11_xcb_LIB,        X11_X11_xcb_FOUND,        X11::X11_xcb
X11_xcb_composite_INCLUDE_PATH,  X11_xcb_composite_LIB,  X11_xcb_composite_FOUND,  X11::xcb_composite
X11_xcb_cursor_INCLUDE_PATH,     X11_xcb_cursor_LIB,     X11_xcb_cursor_FOUND,     X11::xcb_cursor
X11_xcb_damage_INCLUDE_PATH,     X11_xcb_damage_LIB,     X11_xcb_damage_FOUND,     X11::xcb_damage
X11_xcb_dpms_INCLUDE_PATH,       X11_xcb_dpms_LIB,       X11_xcb_dpms_FOUND,       X11::xcb_dpms
X11_xcb_dri2_INCLUDE_PATH,       X11_xcb_dri2_LIB,       X11_xcb_dri2_FOUND,       X11::xcb_dri2
X11_xcb_dri3_INCLUDE_PATH,       X11_xcb_dri3_LIB,       X11_xcb_dri3_FOUND,       X11::xcb_dri3
X11_xcb_errors_INCLUDE_PATH,     X11_xcb_errors_LIB,     X11_xcb_errors_FOUND,     X11::xcb_errors
X11_xcb_ewmh_INCLUDE_PATH,       X11_xcb_ewmh_LIB,       X11_xcb_ewmh_FOUND,       X11::xcb_ewmh
X11_xcb_glx_INCLUDE_PATH,        X11_xcb_glx_LIB,        X11_xcb_glx_FOUND,        X11::xcb_glx
X11_xcb_icccm_INCLUDE_PATH,      X11_xcb_icccm_LIB,      X11_xcb_icccm_FOUND,      X11::xcb_icccm
X11_xcb_image_INCLUDE_PATH,      X11_xcb_image_LIB,      X11_xcb_image_FOUND,      X11::xcb_image
X11_xcb_keysyms_INCLUDE_PATH,    X11_xcb_keysyms_LIB,    X11_xcb_keysyms_FOUND,    X11::xcb_keysyms
X11_xcb_present_INCLUDE_PATH,    X11_xcb_present_LIB,    X11_xcb_present_FOUND,    X11::xcb_present
X11_xcb_randr_INCLUDE_PATH,      X11_xcb_randr_LIB,      X11_xcb_randr_FOUND,      X11::xcb_randr
X11_xcb_record_INCLUDE_PATH,     X11_xcb_record_LIB,     X11_xcb_record_FOUND,     X11::xcb_record
X11_xcb_render_INCLUDE_PATH,     X11_xcb_render_LIB,     X11_xcb_render_FOUND,     X11::xcb_render
X11_xcb_render_util_INCLUDE_PATH,X11_xcb_render_util_LIB,X11_xcb_render_util_FOUND,X11::xcb_render_util
X11_xcb_res_INCLUDE_PATH,        X11_xcb_res_LIB,        X11_xcb_res_FOUND,        X11::xcb_res
X11_xcb_screensaver_INCLUDE_PATH,X11_xcb_screensaver_LIB,X11_xcb_screensaver_FOUND,X11::xcb_screensaver
X11_xcb_shape_INCLUDE_PATH,      X11_xcb_shape_LIB,      X11_xcb_shape_FOUND,      X11::xcb_shape
X11_xcb_shm_INCLUDE_PATH,        X11_xcb_shm_LIB,        X11_xcb_shm_FOUND,        X11::xcb_shm
X11_xcb_sync_INCLUDE_PATH,       X11_xcb_sync_LIB,       X11_xcb_sync_FOUND,       X11::xcb_sync
X11_xcb_util_INCLUDE_PATH,       X11_xcb_util_LIB,       X11_xcb_util_FOUND,       X11::xcb_util
X11_xcb_xf86dri_INCLUDE_PATH,    X11_xcb_xf86dri_LIB,    X11_xcb_xf86dri_FOUND,    X11::xcb_xf86dri
X11_xcb_xfixes_INCLUDE_PATH,     X11_xcb_xfixes_LIB,     X11_xcb_xfixes_FOUND,     X11::xcb_xfixes
X11_xcb_xinerama_INCLUDE_PATH,   X11_xcb_xinerama_LIB,   X11_xcb_xinerama_FOUND,   X11::xcb_xinerama
X11_xcb_xinput_INCLUDE_PATH,     X11_xcb_xinput_LIB,     X11_xcb_xinput_FOUND,     X11::xcb_xinput
X11_xcb_xkb_INCLUDE_PATH,        X11_xcb_xkb_LIB,        X11_xcb_xkb_FOUND,        X11::xcb_xkb
X11_xcb_xrm_INCLUDE_PATH,        X11_xcb_xrm_LIB,        X11_xcb_xrm_FOUND,        X11::xcb_xrm
X11_xcb_xtest_INCLUDE_PATH,      X11_xcb_xtest_LIB,      X11_xcb_xtest_FOUND,      X11::xcb_xtest
X11_xcb_xvmc_INCLUDE_PATH,       X11_xcb_xvmc_LIB,       X11_xcb_xvmc_FOUND,       X11::xcb_xvmc
X11_xcb_xv_INCLUDE_PATH,         X11_xcb_xv_LIB,         X11_xcb_xv_FOUND          X11::xcb_xv
X11_Xcomposite_INCLUDE_PATH,     X11_Xcomposite_LIB,     X11_Xcomposite_FOUND,     X11::Xcomposite
X11_Xcursor_INCLUDE_PATH,        X11_Xcursor_LIB,        X11_Xcursor_FOUND,        X11::Xcursor
X11_Xdamage_INCLUDE_PATH,        X11_Xdamage_LIB,        X11_Xdamage_FOUND,        X11::Xdamage
X11_Xdmcp_INCLUDE_PATH,          X11_Xdmcp_LIB,          X11_Xdmcp_FOUND,          X11::Xdmcp
X11_Xext_INCLUDE_PATH,           X11_Xext_LIB,           X11_Xext_FOUND,           X11::Xext
X11_Xxf86misc_INCLUDE_PATH,      X11_Xxf86misc_LIB,      X11_Xxf86misc_FOUND,      X11::Xxf86misc
X11_Xxf86vm_INCLUDE_PATH,        X11_Xxf86vm_LIB         X11_Xxf86vm_FOUND,        X11::Xxf86vm
X11_Xfixes_INCLUDE_PATH,         X11_Xfixes_LIB,         X11_Xfixes_FOUND,         X11::Xfixes
X11_Xft_INCLUDE_PATH,            X11_Xft_LIB,            X11_Xft_FOUND,            X11::Xft
X11_Xi_INCLUDE_PATH,             X11_Xi_LIB,             X11_Xi_FOUND,             X11::Xi
X11_Xinerama_INCLUDE_PATH,       X11_Xinerama_LIB,       X11_Xinerama_FOUND,       X11::Xinerama
X11_Xkb_INCLUDE_PATH,
X11_Xkblib_INCLUDE_PATH,                                 X11_Xkb_FOUND,            X11::Xkb
X11_xkbcommon_INCLUDE_PATH,      X11_xkbcommon_LIB,      X11_xkbcommon_FOUND,      X11::xkbcommon
X11_xkbcommon_X11_INCLUDE_PATH,  X11_xkbcommon_X11_LIB,  X11_xkbcommon_X11_FOUND,  X11::xkbcommon_X11
X11_xkbfile_INCLUDE_PATH,        X11_xkbfile_LIB,        X11_xkbfile_FOUND,        X11::xkbfile
X11_Xmu_INCLUDE_PATH,            X11_Xmu_LIB,            X11_Xmu_FOUND,            X11::Xmu
X11_Xpm_INCLUDE_PATH,            X11_Xpm_LIB,            X11_Xpm_FOUND,            X11::Xpm
X11_Xpresent_INCLUDE_PATH,       X11_Xpresent_LIB,       X11_Xpresent_FOUND,       X11::Xpresent
X11_Xtst_INCLUDE_PATH,           X11_Xtst_LIB,           X11_Xtst_FOUND,           X11::Xtst
X11_Xrandr_INCLUDE_PATH,         X11_Xrandr_LIB,         X11_Xrandr_FOUND,         X11::Xrandr
X11_Xrender_INCLUDE_PATH,        X11_Xrender_LIB,        X11_Xrender_FOUND,        X11::Xrender
X11_XRes_INCLUDE_PATH,           X11_XRes_LIB,           X11_XRes_FOUND,           X11::XRes
X11_Xss_INCLUDE_PATH,            X11_Xss_LIB,            X11_Xss_FOUND,            X11::Xss
X11_Xt_INCLUDE_PATH,             X11_Xt_LIB,             X11_Xt_FOUND,             X11::Xt
X11_Xutil_INCLUDE_PATH,                                  X11_Xutil_FOUND,          X11::Xutil
X11_Xv_INCLUDE_PATH,             X11_Xv_LIB,             X11_Xv_FOUND,             X11::Xv
X11_dpms_INCLUDE_PATH,           (in X11_Xext_LIB),      X11_dpms_FOUND
X11_Xdbe_INCLUDE_PATH,           (in X11_Xext_LIB),      X11_Xdbe_FOUND
X11_XShm_INCLUDE_PATH,           (in X11_Xext_LIB),      X11_XShm_FOUND
X11_Xshape_INCLUDE_PATH,         (in X11_Xext_LIB),      X11_Xshape_FOUND
X11_XSync_INCLUDE_PATH,          (in X11_Xext_LIB),      X11_XSync_FOUND
X11_Xaw_INCLUDE_PATH,            X11_Xaw_LIB             X11_Xaw_FOUND             X11::Xaw
```

Added in version 3.14: Renamed Xxf86misc, X11_Xxf86misc, X11_Xxf86vm, X11_xkbfile, X11_Xtst, and X11_Xss libraries to match their file names. Deprecated the X11_Xinput library. Old names are still available for compatibility.

Added in version 3.14: Added the X11_Xext_INCLUDE_PATH variable.

Added in version 3.18: Added the xcb, X11-xcb, xcb-icccm, xcb-xkb, xkbcommon, and xkbcommon-X11 libraries.

Added in version 3.19: Added the Xaw, xcb_util, and xcb_xfixes libraries.

Added in version 3.24: Added the xcb_randr, xcb_xtext, and xcb_keysyms libraries.

Added in version 3.27: Added the xcb_composite, xcb_cursor, xcb_damage, xcb_dpms, xcb_dri2, xcb_dri3, xcb_errors, xcb_ewmh, xcb_glx, xcb_image, xcb_present, xcb_record, xcb_render, xcb_render_util, xcb_res, xcb_screensaver, xcb_shape, xcb_shm, xcb_sync, xcb_xf86dri, xcb_xinerama, xcb_xinput, xcb_xrm, xcb_xvmc, and xcb_xv libraries.

Added in version 3.29: Added coverage of double buffer extension (variables X11_Xdbe_INCLUDE_PATH and X11_Xdbe_FOUND).

### FindXalanC
Added in version 3.5.

Finds the Apache Xalan-C++ XSL transform processor headers and libraries:

```
find_package(XalaxC [<version>] [...])
```

Note:

The Xalan-C++ library depends on the Xerces-C++ <#module:FindXercesC> library, which must be found for this module to succeed.

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

XalanC::XalanC

Target encapsulating the Xalan-C++ library usage requirements, available only if Xalan-C++ is found.

### Result Variables
This module defines the following variables:

XalanC_FOUND

Boolean indicating whether (the requested version of) Xalan-C++ was found.

XalanC_VERSION

The version of the found Xalan-C++ library.

XalanC_INCLUDE_DIRS

Include directories needed for using Xalan-C++ library. These contain the Xalan-C++ and Xerces-C++ headers.

XalanC_LIBRARIES

Libraries needed to link against Xalan-C++. These contain the Xalan-C++ and Xerces-C++ libraries.

XalanC_LIBRARY

The path to the Xalan-C++ library (xalan-c), either release or debug variant.

### Cache Variables
The following cache variables may also be set:

XalanC_INCLUDE_DIR

The directory containing the Xalan-C++ headers.

XalanC_LIBRARY_RELEASE

The path to a release (optimized) variant of the Xalan-C++ library.

XalanC_LIBRARY_DEBUG

The path to a debug variant of the Xalan-C++ library.

### Examples
Finding Xalan-C++ library and linking it to a project target:

```
find_package(XalanC)
target_link_libraries(project_target PRIVATE XalanC::XalanC)
```

### FindXCTest
Added in version 3.3.

Finds the XCTest framework for writing unit tests in Xcode projects:

```
find_package(XCTest [...])
```

Note:

Xcode 16 and later includes the Swift Testing framework for writing unit tests in the Swift programming language, which supersedes XCTest.

An XCTest bundle is a CFBundle (Core Foundation Bundle) with a special product type and bundle extension. See the Apple Developer Library for more information in the Testing with Xcode <https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/testing_with_xcode/> documentation.

### Result Variables
This module defines the following variables:

XCTest_FOUND

Boolean indicating whether the XCTest framework and executable were found.

XCTest_INCLUDE_DIRS

Include directories containing the XCTest framework headers needed to use XCTest.

XCTest_LIBRARIES

Libraries needed to link against to use XCTest framework.

### Cache Variables
The following cache variables may also be set:

XCTest_EXECUTABLE

The path to the xctest command-line tool used to execute XCTest bundles.

### Commands
When XCTest is found, this module provides the following commands to help create and run XCTest bundles:

xctest_add_bundle

Creates an XCTest bundle to test a given target:

```
xctest_add_bundle(<bundle> <testee> [<sources>...])
```

This command creates an XCTest bundle named <bundle> that will test the specified <testee> target.

The arguments are:

<bundle>

Name of the XCTest bundle to create. The XCTEST <#prop_tgt:XCTEST> target property will be set on this bundle.

<testee>

Name of the target to test. Supported types for the testee are Frameworks and App Bundles.

<sources>...

One or more source files to add to the bundle. If not provided, they must be added later using commands like target_sources() <#command:target_sources>.

Note:

The CMAKE_OSX_SYSROOT <#variable:CMAKE_OSX_SYSROOT> variable must be set before using this command.

xctest_add_test

Adds an XCTest bundle to the project to be run during the CTest phase:

```
xctest_add_test(<name> <bundle>)
```

This command registers an XCTest bundle to be executed by ctest(1) <#manual:ctest(1)>. The test will be named <name> and will run the specified <bundle>.

The arguments are:

<name>

Name of the test as it will appear in CTest.

<bundle>

Target name of the XCTest bundle.

### Examples
Finding XCTest and adding tests:

```
find_package(XCTest)
add_library(foo SHARED foo.c)
if(XCTest_FOUND)

  xctest_add_bundle(TestAppBundle foo source.swift)

  xctest_add_test(app.TestAppBundle TestAppBundle)
endif()
```

### FindXercesC
Added in version 3.1.

Finds the Apache Xerces-C++ validating XML parser headers and libraries:

```
find_package(XercesC [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

XercesC::XercesC

Added in version 3.5.

Target encapsulating the Xerces-C++ library (xerces-c) usage requirements, available only if Xerces-C++ is found.

### Result Variables
This module defines the following variables:

XercesC_FOUND

Boolean indicating whether (the requested version of) Xerces-C++ was found.

XercesC_VERSION

The version of the found Xerces-C++ library.

XercesC_INCLUDE_DIRS

Include directories needed to use Xerces-C++.

XercesC_LIBRARIES

Libraries needed to link for using Xerces-C++.

XercesC_LIBRARY

The path to the Xerces-C++ library (xerces-c), either release or debug variant.

### Cache Variables
The following cache variables may also be set:

XercesC_INCLUDE_DIR

The directory containing the Xerces-C++ headers.

XercesC_LIBRARY_RELEASE

Added in version 3.4.

The path to a release (optimized) variant of the Xerces-C++ library.

XercesC_LIBRARY_DEBUG

Added in version 3.4.

The path to a debug variant of the Xerces-C++ library.

### Examples
Finding the Xerces-C++ library and linking it to a project target:

```
find_package(XercesC)
target_link_libraries(project_target PRIVATE XercesC::XercesC)
```

### FindXMLRPC
Finds the native XML-RPC library for C and C++:

```
find_package(XMLRPC [...] [COMPONENTS <components>...] [...])
```

XML-RPC is a standard network protocol that enables remote procedure calls (RPC) between systems. It encodes requests and responses in XML and uses HTTP as the transport mechanism.

### Components
The XML-RPC C/C++ library consists of various features (modules) that provide specific functionality. The availability of these features depends on the installed XML-RPC library version and system configuration. Some features also have dependencies on others.

To list the available features on a system, the xmlrpc-c-config command-line utility can be used.

In CMake, these features can be specified as components with the find_package() <#command:find_package> command:

```
find_package(XMLRPC [COMPONENTS <components>...])
```

Components may be:

c++2

C++ wrapper API, replacing the legacy c++ feature.

c++

The legacy C++ wrapper API (superseded by c++2).

client

XML-RPC client functions (also available as the legacy libwww-based feature named libwww-client).

cgi-server

CGI-based server functions.

abyss-server

Abyss-based server functions.

pstream-server

The pstream-based server functions.

server-util

Basic server functions (they are automatically included with *-server features).

abyss

Abyss HTTP server (not needed with abyss-server).

openssl

OpenSSL convenience functions.

If no components are specified, this module searches for XML-RPC library and its include directories without additional features.

### Result Variables
This module defines the following variables:

XMLRPC_FOUND

Boolean indicating whether the XML-RPC library and all its requested components were found.

XMLRPC_INCLUDE_DIRS

Include directories containing xmlrpc.h and other headers needed to use the XML-RPC library.

XMLRPC_LIBRARIES

List of libraries needed for linking to XML-RPC library and its requested features.

### Examples
Finding XML-RPC library and its client feature, and conditionally creating an interface imported target <#imported-targets> that encapsulates its usage requirements for linking to a project target:

```
find_package(XMLRPC REQUIRED COMPONENTS client)
if(XMLRPC_FOUND AND NOT TARGET XMLRPC::XMLRPC)

  add_library(XMLRPC::XMLRPC INTERFACE IMPORTED)

  set_target_properties(

    XMLRPC::XMLRPC

    PROPERTIES

      INTERFACE_INCLUDE_DIRECTORIES "${XMLRPC_INCLUDE_DIRS}"

      INTERFACE_LINK_LIBRARIES "${XMLRPC_LIBRARIES}"

  )
endif()
target_link_libraries(example PRIVATE XMLRPC::XMLRPC)
```

### FindZLIB
Finds the native zlib data compression library:

```
find_package(ZLIB [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

ZLIB::ZLIB

Added in version 3.1.

Target that encapsulates the zlib usage requirements. It is available only when zlib is found.

### Result Variables
This module defines the following variables:

ZLIB_FOUND

Boolean indicating whether (the requested version of) zlib was found.

ZLIB_VERSION

Added in version 3.26.

The version of zlib found.

ZLIB_INCLUDE_DIRS

Include directories containing zlib.h and other headers needed to use zlib.

ZLIB_LIBRARIES

List of libraries needed to link to zlib. Changed in version 3.4: Debug and Release library variants can be now found separately.

### Hints
This module accepts the following variables:

ZLIB_ROOT

A user may set this variable to a zlib installation root to help locate zlib in custom installation paths.

ZLIB_USE_STATIC_LIBS

Added in version 3.24.

Set this variable to ON before calling find_package(ZLIB) to look for static libraries. Default is OFF.

### Deprecated Variables
The following variables are provided for backward compatibility:

ZLIB_VERSION_MAJOR

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The major version of zlib.

ZLIB_VERSION_MINOR

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The minor version of zlib.

ZLIB_VERSION_PATCH

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The patch version of zlib.

ZLIB_VERSION_TWEAK

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The tweak version of zlib.

ZLIB_VERSION_STRING

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The version of zlib found (x.y.z).

ZLIB_MAJOR_VERSION

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The major version of zlib.

ZLIB_MINOR_VERSION

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The minor version of zlib.

ZLIB_PATCH_VERSION

Deprecated since version 3.26: Superseded by ZLIB_VERSION.

The patch version of zlib.

### Examples
Finding zlib and linking it to a project target:

```
find_package(ZLIB)
target_link_libraries(project_target PRIVATE ZLIB::ZLIB)
```

## DEPRECATED MODULES

### AddFileDependencies
Deprecated since version 3.20: Do not use this module in new code.

Instead use the set_property() <#command:set_property> command to append to the OBJECT_DEPENDS <#prop_sf:OBJECT_DEPENDS> source file property directly:

```
set_property(SOURCE <source> APPEND PROPERTY OBJECT_DEPENDS <files>...)
```

Load this module in a CMake project with:

```
include(AddFileDependencies)
```

### Commands
This module provides the following command:

add_file_dependencies

Adds dependencies to a source file:

```
add_file_dependencies(<source> <files>...)
```

This command adds the given <files> to the dependencies of file <source>.

### CMakeDetermineVSServicePack
Changed in version 4.1: This module is available only if policy CMP0196 <#policy:CMP0196> is not set to NEW.

Deprecated since version 3.0: This module should no longer be used. The functionality of this module has been superseded by the CMAKE_<LANG>_COMPILER_VERSION <#variable:CMAKE_<LANG>_COMPILER_VERSION> variable that contains the compiler version number.

This module provides a command to determine the installed Visual Studio service pack version for Visual Studio 2012 and earlier.

Load this module in a CMake project with:

```
include(CMakeDetermineVSServicePack)
```

### Commands
This module provides the following command:

DetermineVSServicePack

Determines the Visual Studio service pack version of the cl compiler in use:

```
DetermineVSServicePack(<variable>)
```

The result is stored in the specified internal cache variable <variable>, which is set to one of the following values, or to an empty string if the service pack cannot be determined:

- vc80, vc80sp1

- vc90, vc90sp1

- vc100, vc100sp1

- vc110, vc110sp1, vc110sp2, vc110sp3, vc110sp4

### Examples
Determining the Visual Studio service pack version in a project:

```
if(MSVC)

  include(CMakeDetermineVSServicePack)

  DetermineVSServicePack(my_service_pack)

  if(my_service_pack)

    message(STATUS "Detected: ${my_service_pack}")

  endif()
endif()
```

### CMakeExpandImportedTargets
Deprecated since version 3.4: This module should no longer be used.

It was once needed to replace Imported Targets <#imported-targets> with their underlying libraries referenced on disk for use with the try_compile() <#command:try_compile> and try_run() <#command:try_run> commands. These commands now support imported targets in their LINK_LIBRARIES options (since CMake 2.8.11 for try_compile() <#command:try_compile> command and since CMake 3.2 for try_run() <#command:try_run> command).

Load this module in a CMake project with:

```
include(CMakeExpandImportedTargets)
```

Note:

This module does not support the policy CMP0022 <#policy:CMP0022> NEW behavior, nor does it use the INTERFACE_LINK_LIBRARIES <#prop_tgt:INTERFACE_LINK_LIBRARIES> property, because generator expressions <#manual:cmake-generator-expressions(7)> cannot be evaluated at the configuration phase.

### Commands
This module provides the following command:

cmake_expand_imported_targets

Expands all imported targets in a given list of libraries to their corresponding file paths on disk and stores the resulting list in a local variable:

```
cmake_expand_imported_targets(

  <result-var>

  LIBRARIES <libs>...

  [CONFIGURATION <config>]
)
```

The arguments are:

<result-var>

Name of a CMake variable containing the resulting list of file paths.

LIBRARIES <libs>...

A semicolon-separated list <#cmake-language-lists> of system and imported targets. Imported targets in this list are replaced with their corresponding library file paths, including libraries from their link interfaces.

CONFIGURATION <config>

If this option is given, it uses the respective build configuration <config> of the imported targets if it exists. If omitted, it defaults to the first entry in the CMAKE_CONFIGURATION_TYPES <#variable:CMAKE_CONFIGURATION_TYPES> variable, or falls back to CMAKE_BUILD_TYPE <#variable:CMAKE_BUILD_TYPE> if CMAKE_CONFIGURATION_TYPES is not set.

### Examples
Using this module to get a list of library paths:

```
include(CMakeExpandImportedTargets)
cmake_expand_imported_targets(

  expandedLibs

  LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}

  CONFIGURATION "${CMAKE_TRY_COMPILE_CONFIGURATION}"
)
```

### CMakeFindFrameworks
Deprecated since version 3.31: This module does nothing, unless policy CMP0173 <#policy:CMP0173> is set to OLD.

helper module to find OSX frameworks

This module reads hints about search locations from variables:

```
CMAKE_FIND_FRAMEWORK_EXTRA_LOCATIONS - Extra directories
```

### CMakeForceCompiler
Deprecated since version 3.6: Do not use.

The commands provided by this module were once intended for use by cross-compiling toolchain files when CMake was not able to automatically detect the compiler identification. Since the introduction of this module, CMake's compiler identification capabilities have improved and can now be taught to recognize any compiler. Furthermore, the suite of information CMake detects from a compiler is now too extensive to be provided by toolchain files using these macros.

One common use case for this module was to skip CMake's checks for a working compiler when using a cross-compiler that cannot link binaries without special flags or custom linker scripts. This case is now supported by setting the CMAKE_TRY_COMPILE_TARGET_TYPE <#variable:CMAKE_TRY_COMPILE_TARGET_TYPE> variable in the toolchain file instead.

Load this module in a CMake toolchain file:

```
include(CMakeForceCompiler)
```

### Commands
This module provides the following commands:

cmake_force_c_compiler

Sets the CMAKE_C_COMPILER <#variable:CMAKE_<LANG>_COMPILER> variable to the given compiler and the CMAKE_C_COMPILER_ID <#variable:CMAKE_<LANG>_COMPILER_ID> variable to the given compiler-id:

```
cmake_force_c_compiler(<compiler> <compiler-id>)
```

This command also bypasses the check for working compiler and basic compiler information tests.

cmake_force_cxx_compiler

Sets the CMAKE_CXX_COMPILER <#variable:CMAKE_<LANG>_COMPILER> variable to the given compiler and the CMAKE_CXX_COMPILER_ID <#variable:CMAKE_<LANG>_COMPILER_ID> variable to the given compiler-id:

```
cmake_force_cxx_compiler(<compiler> <compiler-id>)
```

This command also bypasses the check for working compiler and basic compiler information tests.

cmake_force_fortran_compiler

Sets the CMAKE_Fortran_COMPILER <#variable:CMAKE_<LANG>_COMPILER> variable to the given compiler and the CMAKE_Fortran_COMPILER_ID <#variable:CMAKE_<LANG>_COMPILER_ID> variable to the given compiler-id:

```
cmake_force_fortran_compiler(<compiler> <compiler-id>)
```

This command also bypasses the check for working compiler and basic compiler information tests.

### Examples
A simple toolchain file using this module could look like this:

cmake/toolchains/example-toolchain.cmake

```
include(CMakeForceCompiler)
set(CMAKE_SYSTEM_NAME Generic)
cmake_force_c_compiler(chc12 MetrowerksHicross)
cmake_force_cxx_compiler(chc12 MetrowerksHicross)
```

In new CMake code, compiler is detected automatically when setting required variables instead:

cmake/toolchains/example-toolchain.cmake

```
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_C_COMPILER chc12)
set(CMAKE_CXX_COMPILER chc12)
```

### See Also
•

cmake-toolchains(7) <#manual:cmake-toolchains(7)>

### CMakeParseArguments
Deprecated since version 3.5.

This module once implemented the cmake_parse_arguments() <#command:cmake_parse_arguments> command that is now implemented natively by CMake. It is now an empty placeholder for compatibility with projects that include it to get the command from CMake 3.4 and lower.

### Dart
Deprecated since version 3.27: This module is available only if policy CMP0145 <#policy:CMP0145> is not set to NEW. Do not use it in new code. Use the CTest <#module:CTest> module instead.

Configure a project for testing with CTest or old Dart Tcl Client

This file is the backwards-compatibility version of the CTest module. It supports using the old Dart 1 Tcl client for driving dashboard submissions as well as testing with CTest. This module should be included in the CMakeLists.txt file at the top of a project. Typical usage:

```
include(Dart)
if(BUILD_TESTING)

  # ... testing related CMake code ...
endif()
```

The BUILD_TESTING option is created by the Dart module to determine whether testing support should be enabled. The default is ON.

### Documentation
Deprecated since version 3.18: This module does nothing, unless policy CMP0106 <#policy:CMP0106> is set to OLD.

This module provides support for the VTK documentation framework. It relies on several tools (Doxygen, Perl, etc).

### GetPrerequisites
Deprecated since version 3.16: Use file(GET_RUNTIME_DEPENDENCIES) <#get-runtime-dependencies> instead.

This module provides commands to analyze and list the dependencies (prerequisites) of executable or shared library files. These commands list the shared libraries (.dll, .dylib, or .so files) required by an executable or shared library.

Load this module in CMake with:

```
include(GetPrerequisites)
```

This module determines dependencies using the following platform-specific tools:

- dumpbin (Windows)

- objdump (MinGW on Windows)

- ldd (Linux/Unix)

- otool (Apple operating systems)

Changed in version 3.16: The tool specified by the CMAKE_OBJDUMP <#variable:CMAKE_OBJDUMP> variable will be used, if set.

### Commands
This module provides the following commands:

- get_prerequisites()

- list_prerequisites()

- list_prerequisites_by_glob()

- gp_append_unique()

- is_file_executable()

- gp_item_default_embedded_path() (projects can override it with gp_item_default_embedded_path_override())

- gp_resolve_item() (projects can override it with gp_resolve_item_override())

- gp_resolved_file_type() (projects can override it with gp_resolved_file_type_override())

- gp_file_type()

get_prerequisites

Gets the list of shared library files required by specified target:

```
get_prerequisites(<target> <prerequisites-var> <exclude-system> <recurse>

                  <exepath> <dirs> [<rpaths>])
```

The list in the variable named <prerequisites-var> should be empty on first entry to this command. On exit, <prerequisites-var> will contain the list of required shared library files.

The arguments are:

<target>

The full path to an executable or shared library file.

<prerequisites-var>

The name of a CMake variable to contain the results.

<exclude-system>

If set to 1 system prerequisites will be excluded, if set to 0 they will be included.

<recurse>

If set to 1 all prerequisites will be found recursively, if set to 0 only direct prerequisites are listed.

<exepath>

The path to the top level executable used for @executable_path replacement on Apple operating systems.

<dirs>

A list of paths where libraries might be found: these paths are searched first when a target without any path info is given. Then standard system locations are also searched: PATH, Framework locations, /usr/lib...

<rpaths>

Optional run-time search paths for an executable file or library to help find files.

Added in version 3.14: The variable GET_PREREQUISITES_VERBOSE can be set to true before calling this command to enable verbose output.

list_prerequisites

Prints a message listing the prerequisites of the specified target:

```
list_prerequisites(<target> [<recurse> [<exclude-system> [<verbose>]]])
```

The arguments are:

<target>

The name of a shared library or executable target or the full path to a shared library or executable file.

<recurse>

If set to 1 all prerequisites will be found recursively, if set to 0 only direct prerequisites are listed.

<exclude-system>

If set to 1 system prerequisites will be excluded, if set to 0 they will be included.

<verbose>

If set to 0 only the full path names of the prerequisites are printed. If set to 1 extra information will be displayed.

list_prerequisites_by_glob

Prints the prerequisites of shared library and executable files matching a globbing pattern:

```
list_prerequisites_by_glob(<GLOB|GLOB_RECURSE>

                           <glob-exp>

                           [<optional-args>...])
```

The arguments are:

GLOB or GLOB_RECURSE

The globbing mode, whether to traverse only the match or also its subdirectories recursively.

<glob-exp>

A globbing expression used with file(GLOB) <#glob> or file(GLOB_RECURSE) <#glob-recurse> to retrieve a list of matching files. If a matching file is executable, its prerequisites are listed.

<optional-args>...

Any additional (optional) arguments provided are passed along as the optional arguments to the list_prerequisite() calls.

gp_append_unique

Appends the value to the list only if it is not already in the list:

```
gp_append_unique(<list-var> <value>)
```

The arguments are:

<value>

The value to be appended to the list.

<list-var>

The list variable name that will have the value appended only if it is not already in the list.

is_file_executable

Checks if given file is a binary executable:

```
is_file_executable(<file> <result-var>)
```

This command sets the <result-var> to 1 if <file> is a binary executable; otherwise it sets it to 0.

gp_item_default_embedded_path

Determines the reference path for the specified item:

```
gp_item_default_embedded_path(<item> <default-embedded-path-var>)
```

This command determines the reference path for <item> when it is embedded inside a bundle and stores it to a variable <default-embedded-path-var>.

Projects can override this command by defining a custom gp_item_default_embedded_path_override() command.

gp_resolve_item

Resolves a given item into an existing full path file and stores it to a variable:

```
gp_resolve_item(<context> <item> <exepath> <dirs> <resolved-item-var>

                [<rpaths>])
```

The arguments are:

<context>

The path to the top level loading path used for @loader_path replacement on Apple operating systems. When resolving item, @loader_path references will be resolved relative to the directory of the given context value (presumably another library).

<item>

The item to resolve.

<exepath>

See the argument description in get_prerequisites().

<dirs>

See the argument description in get_prerequisites().

<resolved-item-var>

The result variable where the resolved item is stored into.

<rpaths>

See the argument description in get_prerequisites().

Projects can override this command by defining a custom gp_resolve_item_override() command.

gp_resolved_file_type

Determines the type of a given file:

```
gp_resolved_file_type(<original-file> <file> <exepath> <dirs> <type-var>

                      [<rpaths>])
```

This command determines the type of <file> with respect to the <original-file>. The resulting type of prerequisite is stored in the <type-var> variable.

Use <exepath> and <dirs> if necessary to resolve non-absolute <file> values -- but only for non-embedded items.

<rpaths>

See the argument description in get_prerequisites().

The <type-var> variable will be set to one of the following values:

- system

- local

- embedded

- other

Projects can override this command by defining a custom gp_resolved_file_type_override() command.

gp_file_type

Determines the type of a given file:

```
gp_file_type(<original-file> <file> <type-var>)
```

This command determines the type of <file> with respect to the <original-file>. The resulting type of prerequisite is stored in the <type-var> variable.

The <type-var> variable will be set to one of the following values:

- system

- local

- embedded

- other

### Example: Basic Usage
Printing all dependencies of a shared library, including system libraries, with verbose output:

```
include(GetPrerequisites)
list_prerequisites("path/to/libfoo.dylib" 1 0 1)
```

### Example: Upgrading Code
For example:

```
include(GetPrerequisites)
# ...
gp_append_unique(keys "${key}")
```

the gp_append_unique() can be in new code replaced with:

```
if(NOT key IN_LIST keys)

  list(APPEND keys "${key}")
endif()
```

### MacroAddFileDependencies
Deprecated since version 3.14: Do not use this module in new code.

Instead use the set_property() <#command:set_property> command to append to the OBJECT_DEPENDS <#prop_sf:OBJECT_DEPENDS> source file property directly:

```
set_property(SOURCE <source> APPEND PROPERTY OBJECT_DEPENDS <files>...)
```

Load this module in a CMake project with:

```
include(MacroAddFileDependencies)
```

### Commands
This module provides the following command:

macro_add_file_dependencies

Adds dependencies to a source file:

```
macro_add_file_dependencies(<source> <files>...)
```

This command adds the given <files> to the dependencies of file <source>.

### TestBigEndian
Deprecated since version 3.20: Superseded by the CMAKE_<LANG>_BYTE_ORDER <#variable:CMAKE_<LANG>_BYTE_ORDER> variable.

This module provides a command to check the endianness (byte order) of the target architecture.

Load this module in a CMake project with:

```
include(TestBigEndian)
```

### Commands
This module provides the following command:

test_big_endian

Checks if the target architecture is big-endian or little-endian:

```
test_big_endian(<var>)
```

This command stores in variable <var> either 1 or 0 indicating whether the target architecture is big or little endian.

At least one of the supported languages must be enabled in CMake project when using this command.

Supported languages are C, CXX.

Changed in version 3.20: This command is now mainly a wrapper around the CMAKE_<LANG>_BYTE_ORDER <#variable:CMAKE_<LANG>_BYTE_ORDER> where also OBJC, OBJCXX, and CUDA languages are supported.

### Example: Checking Endianness
Checking endianness of the target architecture with this module and storing the result in a CMake variable WORDS_BIGENDIAN:

```
include(TestBigEndian)
test_big_endian(WORDS_BIGENDIAN)
```

### Example: Checking Endianness in New Code
As of CMake 3.20, this module should be replaced with the CMAKE_<LANG>_BYTE_ORDER <#variable:CMAKE_<LANG>_BYTE_ORDER> variable. For example, in a project, where C language is one of the enabled languages:

```
if(CMAKE_C_BYTE_ORDER STREQUAL "BIG_ENDIAN")

  set(WORDS_BIGENDIAN TRUE)
elseif(CMAKE_C_BYTE_ORDER STREQUAL "LITTLE_ENDIAN")

  set(WORDS_BIGENDIAN FALSE)
else()

  set(WORDS_BIGENDIAN FALSE)

  message(WARNING "Endianness could not be determined.")
endif()
```

### TestCXXAcceptsFlag
Deprecated since version 3.0: This module should no longer be used. It has been superseded by the CheckCXXCompilerFlag <#module:CheckCXXCompilerFlag> module. As of CMake 3.19, the CheckCompilerFlag <#module:CheckCompilerFlag> module is also available for checking flags across multiple languages.

This module provides a command to test whether the C++ (CXX) compiler supports specific flags.

Load this module in a CMake project with:

```
include(TestCXXAcceptsFlag)
```

### Commands
This module provides the following command:

check_cxx_accepts_flag

Checks whether the CXX compiler accepts the specified flags:

```
check_cxx_accepts_flag(<flags> <result-variable>)
```

<flags>

One or more compiler flags to test. For multiple flags, provide them as a space-separated string.

<result-variable>

Name of an internal cache variable that stores the result. It is set to boolean true if the compiler accepts the flags and false otherwise.

### Examples
Checking if the C++ compiler supports specific flags:

```
include(TestCXXAcceptsFlag)
check_cxx_accepts_flag("-fno-common -fstack-clash-protection" HAVE_FLAGS)
```

Migrating to the CheckCompilerFlag <#module:CheckCompilerFlag> module:

```
include(CheckCompilerFlag)
check_compiler_flag(CXX "-fno-common;-fstack-clash-protection" HAVE_FLAGS)
```

### Use_wxWindows
Deprecated since version 2.8.10: This module should no longer be used. Use find_package(wxWidgets) <#module:FindwxWidgets> instead.

This module serves as a convenience wrapper for finding the wxWidgets library (formerly known as wxWindows) and propagates its usage requirements, such as libraries, include directories, and compiler flags, into the current directory scope for use by targets.

Load this module in a CMake project with:

```
include(Use_wxWindows)
```

### Examples
In earlier versions of CMake, wxWidgets (wxWindows) could be found and used in the current directory like this:

CMakeLists.txt

```
include(Use_wxWindows)
```

To request OpenGL support, the WXWINDOWS_USE_GL variable could be set before including this module:

CMakeLists.txt

```
set(WXWINDOWS_USE_GL ON)
include(Use_wxWindows)
add_library(example example.cxx)
```

Starting with CMake 3.0, wxWidgets can be found using the FindwxWidgets <#module:FindwxWidgets> module, which provides the wxWidgets usage requirements either using result variables or imported target as of CMake 3.27:

CMakeLists.txt

```
find_package(wxWidgets)
add_library(example example.cxx)
target_link_libraries(example PRIVATE wxWidgets::wxWidgets)
```

### UseJavaClassFilelist
Changed in version 3.20: This module was previously documented by mistake and was never meant for direct inclusion by project code. See the UseJava <#module:UseJava> module.

### UseJavaSymlinks
Changed in version 3.20: This module was previously documented by mistake and was never meant for direct inclusion by project code. See the UseJava <#module:UseJava> module.

### UsePkgConfig
Deprecated since version 3.0: This module should no longer be used. Instead, use the FindPkgConfig <#module:FindPkgConfig> module or the cmake_pkg_config() <#command:cmake_pkg_config> command.

This module provided a command for finding external packages using pkg-config command-line utility. It has been replaced by the more convenient FindPkgConfig module, which is commonly used in Find Modules <#find-modules>.

As of CMake 3.31, the built-in cmake_pkg_config() <#command:cmake_pkg_config> command provides even more features to extract package information.

Load this module in a CMake project with:

```
include(UsePkgConfig)
```

### Commands
This module provides the following command:

pkgconfig

Finds external package using pkg-config and sets result variables:

```
pkgconfig(<package> <includedir> <libdir> <linkflags> <cflags>)
```

This command invokes pkg-config command-line utility to retrieve the package information into specified variables. If pkg-config or the specified package <package> is NOT found, the result variables remain empty.

The arguments are:

<package>

Name of the package as defined in its PC metadata file (<package>.pc).

<includedir>

Variable name to store the package's include directory.

<libdir>

Variable name to store the directory containing the package library.

<linkflags>

Variable name to store the linker flags for the package.

<cflags>

Variable name to store the compiler flags for the package.

### Examples
Using this module fills the desired information into the four given variables:

```
include(UsePkgConfig)
pkgconfig(

  libart-2.0

  LIBART_INCLUDEDIR

  LIBART_LIBDIR

  LIBART_LDFLAGS

  LIBART_CFLAGS
)
```

Migrating to the FindPkgConfig <#module:FindPkgConfig> would look something like this:

```
find_package(PkgConfig QUIET)
if(PkgConfig_FOUND)

  pkg_check_modules(LIBART QUIET libart-2.0)
endif()
message(STATUS "LIBART_INCLUDEDIR=${LIBART_INCLUDEDIR}")
message(STATUS "LIBART_LIBDIR=${LIBART_LIBDIR}")
message(STATUS "LIBART_LDFLAGS=${LIBART_LDFLAGS}")
message(STATUS "LIBART_CFLAGS=${LIBART_CFLAGS}")
```

### WriteBasicConfigVersionFile
Deprecated since version 3.0: Use the identical command write_basic_package_version_file() <#command:write_basic_package_version_file> from module CMakePackageConfigHelpers <#module:CMakePackageConfigHelpers>.

```
WRITE_BASIC_CONFIG_VERSION_FILE(filename

  [VERSION major.minor.patch]

  COMPATIBILITY (AnyNewerVersion|SameMajorVersion|SameMinorVersion|ExactVersion)

  [ARCH_INDEPENDENT]

  )
```

### WriteCompilerDetectionHeader
Deprecated since version 3.20: This module is available only if policy CMP0120 <#policy:CMP0120> is not set to NEW. Do not use it in new code.

Added in version 3.1.

This module provides a command to generate header with preprocessor macros.

Load this module in a CMake project with:

```
include(WriteCompilerDetectionHeader)
```

### Commands
This module provides the following command:

write_compiler_detection_header

This function can be used to generate a file suitable for preprocessor inclusion which contains macros to be used in source code:

```
write_compiler_detection_header(

          FILE <file>

          PREFIX <prefix>

          [OUTPUT_FILES_VAR <output_files_var> OUTPUT_DIR <output_dir>]

          COMPILERS <compiler> [...]

          FEATURES <feature> [...]

          [BARE_FEATURES <feature> [...]]

          [VERSION <version>]

          [PROLOG <prolog>]

          [EPILOG <epilog>]

          [ALLOW_UNKNOWN_COMPILERS]

          [ALLOW_UNKNOWN_COMPILER_VERSIONS]
)
```

This generates the file <file> with macros which all have the prefix <prefix>.

By default, all content is written directly to the <file>. The OUTPUT_FILES_VAR may be specified to cause the compiler-specific content to be written to separate files. The separate files are then available in the <output_files_var> and may be consumed by the caller for installation for example. The OUTPUT_DIR specifies a relative path from the main <file> to the compiler-specific files. For example:

```
write_compiler_detection_header(

  FILE climbingstats_compiler_detection.h

  PREFIX ClimbingStats

  OUTPUT_FILES_VAR support_files

  OUTPUT_DIR compilers

  COMPILERS GNU Clang MSVC Intel

  FEATURES cxx_variadic_templates
)
install(FILES

  ${CMAKE_CURRENT_BINARY_DIR}/climbingstats_compiler_detection.h

  DESTINATION include
)
install(FILES

  ${support_files}

  DESTINATION include/compilers
)
```

VERSION may be used to specify the API version to be generated. Future versions of CMake may introduce alternative APIs. A given API is selected by any <version> value greater than or equal to the version of CMake that introduced the given API and less than the version of CMake that introduced its succeeding API. The value of the CMAKE_MINIMUM_REQUIRED_VERSION <#variable:CMAKE_MINIMUM_REQUIRED_VERSION> variable is used if no explicit version is specified. (As of CMake version 4.3.4 there is only one API version.)

PROLOG may be specified as text content to write at the start of the header. EPILOG may be specified as text content to write at the end of the header

At least one <compiler> and one <feature> must be listed. Compilers which are known to CMake, but not specified are detected and a preprocessor #error is generated for them. A preprocessor macro matching <PREFIX>_COMPILER_IS_<compiler> is generated for each compiler known to CMake to contain the value 0 or 1.

Possible compiler identifiers are documented with the CMAKE_<LANG>_COMPILER_ID <#variable:CMAKE_<LANG>_COMPILER_ID> variable. Available features in this version of CMake are listed in the CMAKE_C_KNOWN_FEATURES <#prop_gbl:CMAKE_C_KNOWN_FEATURES> and CMAKE_CXX_KNOWN_FEATURES <#prop_gbl:CMAKE_CXX_KNOWN_FEATURES> global properties. See the cmake-compile-features(7) <#manual:cmake-compile-features(7)> manual for information on compile features.

Added in version 3.2: Added MSVC and AppleClang compiler support.

Added in version 3.6: Added Intel compiler support.

Changed in version 3.8: The {c,cxx}_std_* meta-features are ignored if requested.

Added in version 3.8: ALLOW_UNKNOWN_COMPILERS and ALLOW_UNKNOWN_COMPILER_VERSIONS cause the module to generate conditions that treat unknown compilers as simply lacking all features. Without these options the default behavior is to generate a #error for unknown compilers and versions.

Added in version 3.12: BARE_FEATURES will define the compatibility macros with the name used in newer versions of the language standard, so the code can use the new feature name unconditionally.

### Feature Test Macros
For each compiler, a preprocessor macro is generated matching <PREFIX>_COMPILER_IS_<compiler> which has the content either 0 or 1, depending on the compiler in use. Preprocessor macros for compiler version components are generated matching <PREFIX>_COMPILER_VERSION_MAJOR <PREFIX>_COMPILER_VERSION_MINOR and <PREFIX>_COMPILER_VERSION_PATCH containing decimal values for the corresponding compiler version components, if defined.

A preprocessor test is generated based on the compiler version denoting whether each feature is enabled. A preprocessor macro matching <PREFIX>_COMPILER_<FEATURE>, where <FEATURE> is the upper-case <feature> name, is generated to contain the value 0 or 1 depending on whether the compiler in use supports the feature:

```
write_compiler_detection_header(

  FILE climbingstats_compiler_detection.h

  PREFIX ClimbingStats

  COMPILERS GNU Clang AppleClang MSVC Intel

  FEATURES cxx_variadic_templates
)
```

```
#if ClimbingStats_COMPILER_CXX_VARIADIC_TEMPLATES
template<typename... T>
void someInterface(T t...) { /* ... */ }
#else
// Compatibility versions
template<typename T1>
void someInterface(T1 t1) { /* ... */ }
template<typename T1, typename T2>
void someInterface(T1 t1, T2 t2) { /* ... */ }
template<typename T1, typename T2, typename T3>
void someInterface(T1 t1, T2 t2, T3 t3) { /* ... */ }
#endif
```

### Symbol Macros
Some additional symbol-defines are created for particular features for use as symbols which may be conditionally defined empty:

```
class MyClass ClimbingStats_FINAL
{

    ClimbingStats_CONSTEXPR int someInterface() { return 42; }
};
```

The ClimbingStats_FINAL macro will expand to final if the compiler (and its flags) support the cxx_final feature, and the ClimbingStats_CONSTEXPR macro will expand to constexpr if cxx_constexpr is supported.

If BARE_FEATURES cxx_final was given as argument the final keyword will be defined for old compilers, too.

The following features generate corresponding symbol defines and if they are available as BARE_FEATURES:

Feature

Define

Symbol

bare

c_restrict

<PREFIX>_RESTRICT

restrict

yes

cxx_constexpr

<PREFIX>_CONSTEXPR

constexpr

yes

cxx_deleted_functions

<PREFIX>_DELETED_FUNCTION

= delete

cxx_extern_templates

<PREFIX>_EXTERN_TEMPLATE

extern

cxx_final

<PREFIX>_FINAL

final

yes

cxx_noexcept

<PREFIX>_NOEXCEPT

noexcept

yes

cxx_noexcept

<PREFIX>_NOEXCEPT_EXPR(X)

noexcept(X)

cxx_override

<PREFIX>_OVERRIDE

override

yes

### Compatibility Implementation Macros
Some features are suitable for wrapping in a macro with a backward compatibility implementation if the compiler does not support the feature.

When the cxx_static_assert feature is not provided by the compiler, a compatibility implementation is available via the <PREFIX>_STATIC_ASSERT(COND) and <PREFIX>_STATIC_ASSERT_MSG(COND, MSG) function-like macros. The macros expand to static_assert where that compiler feature is available, and to a compatibility implementation otherwise. In the first form, the condition is stringified in the message field of static_assert. In the second form, the message MSG is passed to the message field of static_assert, or ignored if using the backward compatibility implementation.

The cxx_attribute_deprecated feature provides a macro definition <PREFIX>_DEPRECATED, which expands to either the standard [[deprecated]] attribute or a compiler-specific decorator such as __attribute__((__deprecated__)) used by GNU compilers.

The cxx_alignas feature provides a macro definition <PREFIX>_ALIGNAS which expands to either the standard alignas decorator or a compiler-specific decorator such as __attribute__ ((__aligned__)) used by GNU compilers.

The cxx_alignof feature provides a macro definition <PREFIX>_ALIGNOF which expands to either the standard alignof decorator or a compiler-specific decorator such as __alignof__ used by GNU compilers.

Feature

Define

Symbol

bare

cxx_alignas

<PREFIX>_ALIGNAS

alignas

cxx_alignof

<PREFIX>_ALIGNOF

alignof

cxx_nullptr

<PREFIX>_NULLPTR

nullptr

yes

cxx_static_assert

<PREFIX>_STATIC_ASSERT

static_assert

cxx_static_assert

<PREFIX>_STATIC_ASSERT_MSG

static_assert

cxx_attribute_deprecated

<PREFIX>_DEPRECATED

[[deprecated]]

cxx_attribute_deprecated

<PREFIX>_DEPRECATED_MSG

[[deprecated]]

cxx_thread_local

<PREFIX>_THREAD_LOCAL

thread_local

A use-case which arises with such deprecation macros is the deprecation of an entire library. In that case, all public API in the library may be decorated with the <PREFIX>_DEPRECATED macro. This results in very noisy build output when building the library itself, so the macro may be may be defined to empty in that case when building the deprecated library:

```
add_library(compat_support ${srcs})
target_compile_definitions(compat_support

  PRIVATE

    CompatSupport_DEPRECATED=
)
```

### Example Usage
Note:

This section was migrated from the cmake-compile-features(7) <#manual:cmake-compile-features(7)> manual since it relies on the WriteCompilerDetectionHeader module which is removed by policy CMP0120 <#policy:CMP0120>.

Compile features may be preferred if available, without creating a hard requirement. For example, a library may provide alternative implementations depending on whether the cxx_variadic_templates feature is available:

```
#if Foo_COMPILER_CXX_VARIADIC_TEMPLATES
template<int I, int... Is>
struct Interface;
template<int I>
struct Interface<I>
{

  static int accumulate()

  {

    return I;

  }
};
template<int I, int... Is>
struct Interface
{

  static int accumulate()

  {

    return I + Interface<Is...>::accumulate();

  }
};
#else
template<int I1, int I2 = 0, int I3 = 0, int I4 = 0>
struct Interface
{

  static int accumulate() { return I1 + I2 + I3 + I4; }
};
#endif
```

Such an interface depends on using the correct preprocessor defines for the compiler features. CMake can generate a header file containing such defines using the WriteCompilerDetectionHeader module. The module contains the write_compiler_detection_header function which accepts parameters to control the content of the generated header file:

```
write_compiler_detection_header(

  FILE "${CMAKE_CURRENT_BINARY_DIR}/foo_compiler_detection.h"

  PREFIX Foo

  COMPILERS GNU

  FEATURES

    cxx_variadic_templates
)
```

Such a header file may be used internally in the source code of a project, and it may be installed and used in the interface of library code.

For each feature listed in FEATURES, a preprocessor definition is created in the header file, and defined to either 1 or 0.

Additionally, some features call for additional defines, such as the cxx_final and cxx_override features. Rather than being used in #ifdef code, the final keyword is abstracted by a symbol which is defined to either final, a compiler-specific equivalent, or to empty. That way, C++ code can be written to unconditionally use the symbol, and compiler support determines what it is expanded to:

```
struct Interface {

  virtual void Execute() = 0;
};
struct Concrete Foo_FINAL {

  void Execute() Foo_OVERRIDE;
};
```

In this case, Foo_FINAL will expand to final if the compiler supports the keyword, or to empty otherwise.

In this use-case, the project code may wish to enable a particular language standard if available from the compiler. The CXX_STANDARD <#prop_tgt:CXX_STANDARD> target property may be set to the desired language standard for a particular target, and the CMAKE_CXX_STANDARD <#variable:CMAKE_CXX_STANDARD> variable may be set to influence all following targets:

```
write_compiler_detection_header(

  FILE "${CMAKE_CURRENT_BINARY_DIR}/foo_compiler_detection.h"

  PREFIX Foo

  COMPILERS GNU

  FEATURES

    cxx_final cxx_override
)
# Includes foo_compiler_detection.h and uses the Foo_FINAL symbol
# which will expand to 'final' if the compiler supports the requested
# CXX_STANDARD.
add_library(foo foo.cpp)
set_property(TARGET foo PROPERTY CXX_STANDARD 11)
# Includes foo_compiler_detection.h and uses the Foo_FINAL symbol
# which will expand to 'final' if the compiler supports the feature,
# even though CXX_STANDARD is not set explicitly.  The requirement of
# cxx_constexpr causes CMake to set CXX_STANDARD internally, which
# affects the compile flags.
add_library(foo_impl foo_impl.cpp)
target_compile_features(foo_impl PRIVATE cxx_constexpr)
```

The write_compiler_detection_header function also creates compatibility code for other features which have standard equivalents. For example, the cxx_static_assert feature is emulated with a template and abstracted via the <PREFIX>_STATIC_ASSERT and <PREFIX>_STATIC_ASSERT_MSG function-macros.

### FindBoost
Changed in version 3.30: This module is available only if policy CMP0167 <#policy:CMP0167> is not set to NEW. Port projects to upstream Boost's BoostConfig.cmake package configuration file, for which find_package(Boost) now searches.

Find Boost include dirs and libraries

Use this module by invoking find_package() <#command:find_package> with the form:

```
find_package(Boost

  [version] [EXACT]      # Minimum or EXACT version e.g. 1.67.0

  [REQUIRED]             # Fail with error if Boost is not found

  [COMPONENTS <libs>...] # Boost libraries by their canonical name

                         # e.g. "date_time" for "libboost_date_time"

  [OPTIONAL_COMPONENTS <libs>...]

                         # Optional Boost libraries by their canonical name)

  )                      # e.g. "date_time" for "libboost_date_time"
```

This module finds headers and requested component libraries OR a CMake package configuration file provided by a "Boost CMake" build. For the latter case skip to the Boost CMake section below.

Added in version 3.7: bzip2 and zlib components (Windows only).

Added in version 3.11: The OPTIONAL_COMPONENTS option.

Added in version 3.13: stacktrace_* components.

Added in version 3.19: bzip2 and zlib components on all platforms.

### Result Variables
This module defines the following variables:

Boost_FOUND

Boolean indicating whether headers and requested libraries were found.

Boost_INCLUDE_DIRS

Boost include directories.

Boost_LIBRARY_DIRS

Link directories for Boost libraries.

Boost_LIBRARIES

Boost component libraries to be linked.

Boost_<COMPONENT>_FOUND

Boolean indicating whether the component <COMPONENT> was found (<COMPONENT> name is upper-case).

Boost_<COMPONENT>_LIBRARY

Libraries to link for component <COMPONENT> (may include target_link_libraries() <#command:target_link_libraries> debug/optimized keywords).

Boost_VERSION_MACRO

BOOST_VERSION value from boost/version.hpp.

Boost_VERSION_STRING

Boost version number in X.Y.Z format.

Boost_VERSION

Boost version number in X.Y.Z format (same as Boost_VERSION_STRING). Changed in version 3.15: In previous CMake versions, this variable used the raw version string from the Boost header (same as Boost_VERSION_MACRO). See policy CMP0093 <#policy:CMP0093>.

Boost_LIB_VERSION

Version string appended to library filenames.

Boost_VERSION_MAJOR, Boost_MAJOR_VERSION

Boost major version number (X in X.Y.Z).

Boost_VERSION_MINOR, Boost_MINOR_VERSION

Boost minor version number (Y in X.Y.Z).

Boost_VERSION_PATCH, Boost_SUBMINOR_VERSION

Boost subminor version number (Z in X.Y.Z).

Boost_VERSION_COUNT

Amount of version components (3).

Boost_LIB_DIAGNOSTIC_DEFINITIONS (Windows-specific)

Pass to add_definitions() <#command:add_definitions> to have diagnostic information about Boost's automatic linking displayed during compilation

Added in version 3.15: The Boost_VERSION_<PART> variables.

### Cache Variables
Search results are saved persistently in CMake cache entries:

Boost_INCLUDE_DIR

Directory containing Boost headers.

Boost_LIBRARY_DIR_RELEASE

Directory containing release Boost libraries.

Boost_LIBRARY_DIR_DEBUG

Directory containing debug Boost libraries.

Boost_<COMPONENT>_LIBRARY_DEBUG

Component <COMPONENT> library debug variant.

Boost_<COMPONENT>_LIBRARY_RELEASE

Component <COMPONENT> library release variant.

Added in version 3.3: Per-configuration variables Boost_LIBRARY_DIR_RELEASE and Boost_LIBRARY_DIR_DEBUG.

### Hints
This module reads hints about search locations from variables:

BOOST_ROOT, BOOSTROOT

Preferred installation prefix.

BOOST_INCLUDEDIR

Preferred include directory e.g. <prefix>/include.

BOOST_LIBRARYDIR

Preferred library directory e.g. <prefix>/lib.

Boost_NO_SYSTEM_PATHS

Set to ON to disable searching in locations not specified by these hint variables. Default is OFF.

Boost_ADDITIONAL_VERSIONS

List of Boost versions not known to this module. (Boost install locations may contain the version).

Users may set these hints or results as CACHE entries. Projects should not read these entries directly but instead use the above result variables. Note that some hint names start in upper-case BOOST. One may specify these as environment variables if they are not specified as CMake variables or cache entries.

This module first searches for the Boost header files using the above hint variables (excluding BOOST_LIBRARYDIR) and saves the result in Boost_INCLUDE_DIR. Then it searches for requested component libraries using the above hints (excluding BOOST_INCLUDEDIR and Boost_ADDITIONAL_VERSIONS), "lib" directories near Boost_INCLUDE_DIR, and the library name configuration settings below. It saves the library directories in Boost_LIBRARY_DIR_DEBUG and Boost_LIBRARY_DIR_RELEASE and individual library locations in Boost_<COMPONENT>_LIBRARY_DEBUG and Boost_<COMPONENT>_LIBRARY_RELEASE. When one changes settings used by previous searches in the same build tree (excluding environment variables) this module discards previous search results affected by the changes and searches again.

### Imported Targets
Added in version 3.5.

This module provides the following Imported Targets <#imported-targets>:

Boost::boost

Target for header-only dependencies. (Boost include directory).

Boost::headers

Added in version 3.15: Alias for Boost::boost.

Boost::<component>

Target for specific component dependency (shared or static library); <component> name is lower-case.

Boost::diagnostic_definitions

Interface target to enable diagnostic information about Boost's automatic linking during compilation (adds -DBOOST_LIB_DIAGNOSTIC).

Boost::disable_autolinking

Interface target to disable automatic linking with MSVC (adds -DBOOST_ALL_NO_LIB).

Boost::dynamic_linking

Interface target to enable dynamic linking with MSVC (adds -DBOOST_ALL_DYN_LINK).

Implicit dependencies such as Boost::filesystem requiring Boost::system will be automatically detected and satisfied, even if system is not specified when using find_package() <#command:find_package> and if Boost::system is not added to target_link_libraries() <#command:target_link_libraries>. If using Boost::thread, then Threads::Threads will also be added automatically.

It is important to note that the imported targets behave differently than variables created by this module: multiple calls to find_package(Boost) <#command:find_package> in the same directory or sub-directories with different options (e.g. static or shared) will not override the values of the targets created by the first call.

### Other Variables
Boost libraries come in many variants encoded in their file name. Users or projects may tell this module which variant to find by setting variables:

Boost_USE_DEBUG_LIBS

Added in version 3.10.

Set to ON or OFF to specify whether to search and use the debug libraries. Default is ON.

Boost_USE_RELEASE_LIBS

Added in version 3.10.

Set to ON or OFF to specify whether to search and use the release libraries. Default is ON.

Boost_USE_MULTITHREADED

Set to OFF to use the non-multithreaded libraries ("mt" tag). Default is ON.

Boost_USE_STATIC_LIBS

Set to ON to force the use of the static libraries. Default is OFF.

Boost_USE_STATIC_RUNTIME

Set to ON or OFF to specify whether to use libraries linked statically to the C++ runtime ("s" tag). Default is platform dependent.

Boost_USE_DEBUG_RUNTIME

Set to ON or OFF to specify whether to use libraries linked to the MS debug C++ runtime ("g" tag). Default is ON.

Boost_USE_DEBUG_PYTHON

Set to ON to use libraries compiled with a debug Python build ("y" tag). Default is OFF.

Boost_USE_STLPORT

Set to ON to use libraries compiled with STLPort ("p" tag). Default is OFF.

Boost_USE_STLPORT_DEPRECATED_NATIVE_IOSTREAMS

Set to ON to use libraries compiled with STLPort deprecated "native iostreams" ("n" tag). Default is OFF.

Boost_COMPILER

Set to the compiler-specific library suffix (e.g. -gcc43). Default is auto-computed for the C++ compiler in use. Changed in version 3.9: A list may be used if multiple compatible suffixes should be tested for, in decreasing order of preference.

Boost_LIB_PREFIX

Added in version 3.18.

Set to the platform-specific library name prefix (e.g. lib) used by Boost static libs. This is needed only on platforms where CMake does not know the prefix by default.

Boost_ARCHITECTURE

Added in version 3.13.

Set to the architecture-specific library suffix (e.g. -x64). Default is auto-computed for the C++ compiler in use.

Boost_THREADAPI

Suffix for thread component library name, such as pthread or win32. Names with and without this suffix will both be tried.

Boost_NAMESPACE

Alternate namespace used to build boost with e.g. if set to myboost, will search for myboost_thread instead of boost_thread.

Other variables one may set to control this module are:

Boost_DEBUG

Set to ON to enable debug output from FindBoost. Please enable this before filing any bug report.

Boost_REALPATH

Set to ON to resolve symlinks for discovered libraries to assist with packaging. For example, the "system" component library may be resolved to /usr/lib/libboost_system.so.1.67.0 instead of /usr/lib/libboost_system.so. This does not affect linking and should not be enabled unless the user needs this information.

Boost_LIBRARY_DIR

Default value for Boost_LIBRARY_DIR_RELEASE and Boost_LIBRARY_DIR_DEBUG.

Boost_NO_WARN_NEW_VERSIONS

Added in version 3.20.

Set to ON to suppress the warning about unknown dependencies for new Boost versions.

On Visual Studio and Borland compilers Boost headers request automatic linking to corresponding libraries. This requires matching libraries to be linked explicitly or available in the link library search path. In this case setting Boost_USE_STATIC_LIBS to OFF may not achieve dynamic linking. Boost automatic linking typically requests static libraries with a few exceptions (such as Boost.Python). Use:

```
add_definitions(${Boost_LIB_DIAGNOSTIC_DEFINITIONS})
```

to ask Boost to report information about automatic linking requests.

### Examples
Find Boost headers only:

```
find_package(Boost 1.36.0)
if(Boost_FOUND)

  include_directories(${Boost_INCLUDE_DIRS})

  add_executable(foo foo.cc)
endif()
```

Find Boost libraries and use imported targets:

```
find_package(Boost 1.56 REQUIRED COMPONENTS

             date_time filesystem iostreams)
add_executable(foo foo.cc)
target_link_libraries(foo Boost::date_time Boost::filesystem

                          Boost::iostreams)
```

Find Boost Python 3.6 libraries and use imported targets:

```
find_package(Boost 1.67 REQUIRED COMPONENTS

             python36 numpy36)
add_executable(foo foo.cc)
target_link_libraries(foo Boost::python36 Boost::numpy36)
```

Find Boost headers and some static (release only) libraries:

```
set(Boost_USE_STATIC_LIBS        ON)  # only find static libs
set(Boost_USE_DEBUG_LIBS        OFF)  # ignore debug libs and
set(Boost_USE_RELEASE_LIBS       ON)  # only find release libs
set(Boost_USE_MULTITHREADED      ON)
set(Boost_USE_STATIC_RUNTIME    OFF)
find_package(Boost 1.66.0 COMPONENTS date_time filesystem system ...)
if(Boost_FOUND)

  include_directories(${Boost_INCLUDE_DIRS})

  add_executable(foo foo.cc)

  target_link_libraries(foo ${Boost_LIBRARIES})
endif()
```

### Boost CMake
If Boost was built using the boost-cmake project or from Boost 1.70.0 on it provides a package configuration file for use with find_package's config mode. This module looks for the package configuration file called BoostConfig.cmake or boost-config.cmake and stores the result in CACHE entry Boost_DIR. If found, the package configuration file is loaded and this module returns with no further action. See documentation of the Boost CMake package configuration for details on what it provides.

Set Boost_NO_BOOST_CMAKE to ON, to disable the search for boost-cmake.

### FindCABLE
Changed in version 4.1: This module is available only if policy CMP0191 <#policy:CMP0191> is not set to NEW.

Finds the CABLE installation and determines its include paths and libraries:

```
find_package(CABLE [...])
```

Package called CABLE (CABLE Automates Bindings for Language Extension) was initially developed by Kitware to generate bindings to C++ classes for use in interpreted languages, such as Tcl. It worked in conjunction with packages like GCC-XML. The CABLE package has since been superseded by the ITK CableSwig package.

Note:

When building wrappers for interpreted languages, these packages are no longer necessary. The CastXML package now serves as the recommended tool for this purpose and can be found directly using the find_program() <#command:find_program> command.

### Cache Variables
The following cache variables may also be set:

CABLE

Path to the cable executable.

CABLE_INCLUDE_DIR

Path to the include directory.

CABLE_TCL_LIBRARY

Path to the Tcl wrapper library.

### Examples
Finding CABLE to build Tcl wrapper, by linking library and adding the include directories:

```
find_package(CABLE)
target_link_libraries(tcl_wrapper_target PRIVATE ${CABLE_TCL_LIBRARY})
target_include_directories(tcl_wrapper_target PRIVATE ${CABLE_INCLUDE_DIR})
```

### FindCUDA
Changed in version 3.27: This module is available only if policy CMP0146 <#policy:CMP0146> is not set to NEW. Port projects to CMake's first-class CUDA language support.

Deprecated since version 3.10: Do not use this module in new code.

It is no longer necessary to use this module or call find_package(CUDA) for compiling CUDA code. Instead, list CUDA among the languages named in the top-level call to the project() <#command:project> command, or call the enable_language() <#command:enable_language> command with CUDA. Then one can add CUDA (.cu) sources directly to targets similar to other languages.

Added in version 3.17: To find and use the CUDA toolkit libraries manually, use the FindCUDAToolkit <#module:FindCUDAToolkit> module instead. It works regardless of the CUDA language being enabled.

### Documentation of Deprecated Usage
Tools for building CUDA C files: libraries and build dependencies.

This script locates the NVIDIA CUDA C tools. It should work on Linux, Windows, and macOS and should be reasonably up to date with CUDA C releases.

Added in version 3.19: QNX support.

This script makes use of the standard find_package() <#command:find_package> arguments of <VERSION>, REQUIRED and QUIET. CUDA_FOUND will report if an acceptable version of CUDA was found.

The script will prompt the user to specify CUDA_TOOLKIT_ROOT_DIR if the prefix cannot be determined by the location of nvcc in the system path and REQUIRED is specified to find_package() <#command:find_package>. To use a different installed version of the toolkit set the environment variable CUDA_BIN_PATH before running cmake (e.g. CUDA_BIN_PATH=/usr/local/cuda1.0 instead of the default /usr/local/cuda) or set CUDA_TOOLKIT_ROOT_DIR after configuring. If you change the value of CUDA_TOOLKIT_ROOT_DIR, various components that depend on the path will be relocated.

It might be necessary to set CUDA_TOOLKIT_ROOT_DIR manually on certain platforms, or to use a CUDA runtime not installed in the default location. In newer versions of the toolkit the CUDA library is included with the graphics driver -- be sure that the driver version matches what is needed by the CUDA runtime version.

### Input Variables
The following variables affect the behavior of the macros in the script (in alphabetical order). Note that any of these flags can be changed multiple times in the same directory before calling cuda_add_executable(), cuda_add_library(), cuda_compile(), cuda_compile_ptx(), cuda_compile_fatbin(), cuda_compile_cubin() or cuda_wrap_srcs():

CUDA_64_BIT_DEVICE_CODE (Default: host bit size)

Set to ON to compile for 64 bit device code, OFF for 32 bit device code. Note that making this different from the host code when generating object or C files from CUDA code just won't work, because size_t gets defined by nvcc in the generated source. If you compile to PTX and then load the file yourself, you can mix bit sizes between device and host.

CUDA_ATTACH_VS_BUILD_RULE_TO_CUDA_FILE (Default: ON)

Set to ON if you want the custom build rule to be attached to the source file in Visual Studio. Turn OFF if you add the same cuda file to multiple targets. This allows the user to build the target from the CUDA file; however, bad things can happen if the CUDA source file is added to multiple targets. When performing parallel builds it is possible for the custom build command to be run more than once and in parallel causing cryptic build errors. VS runs the rules for every source file in the target, and a source can have only one rule no matter how many projects it is added to. When the rule is run from multiple targets race conditions can occur on the generated file. Eventually everything will get built, but if the user is unaware of this behavior, there may be confusion. It would be nice if this script could detect the reuse of source files across multiple targets and turn the option off for the user, but no good solution could be found.

CUDA_BUILD_CUBIN (Default: OFF)

Set to ON to enable and extra compilation pass with the -cubin option in Device mode. The output is parsed and register, shared memory usage is printed during build.

CUDA_BUILD_EMULATION (Default: OFF for device mode)

Set to ON for Emulation mode. -D_DEVICEEMU is defined for CUDA C files when CUDA_BUILD_EMULATION is TRUE.

CUDA_LINK_LIBRARIES_KEYWORD (Default: "")

Added in version 3.9.

The <PRIVATE|PUBLIC|INTERFACE> keyword to use for internal target_link_libraries() <#command:target_link_libraries> calls. The default is to use no keyword which uses the old "plain" form of target_link_libraries() <#command:target_link_libraries>. Note that is matters because whatever is used inside the FindCUDA module must also be used outside - the two forms of target_link_libraries() <#command:target_link_libraries> cannot be mixed.

CUDA_GENERATED_OUTPUT_DIR (Default: CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>)

Set to the path you wish to have the generated files placed. If it is blank output files will be placed in CMAKE_CURRENT_BINARY_DIR <#variable:CMAKE_CURRENT_BINARY_DIR>. Intermediate files will always be placed in CMAKE_CURRENT_BINARY_DIR/CMakeFiles.

CUDA_HOST_COMPILATION_CPP (Default: ON)

Set to OFF for C compilation of host code.

CUDA_HOST_COMPILER (Default: CMAKE_C_COMPILER)

Set the host compiler to be used by nvcc. Ignored if -ccbin or --compiler-bindir is already present in the CUDA_NVCC_FLAGS or CUDA_NVCC_FLAGS_<CONFIG> variables. For Visual Studio targets, the host compiler is constructed with one or more visual studio macros such as $(VCInstallDir), that expands out to the path when the command is run from within VS. Added in version 3.13: If the CUDAHOSTCXX <#envvar:CUDAHOSTCXX> environment variable is set it will be used as the default.

CUDA_NVCC_FLAGS, CUDA_NVCC_FLAGS_<CONFIG>

Additional NVCC command line arguments. NOTE: multiple arguments must be semi-colon delimited (e.g. --compiler-options;-Wall) Added in version 3.6: Contents of these variables may use generator expressions <#manual:cmake-generator-expressions(7)>.

CUDA_PROPAGATE_HOST_FLAGS (Default: ON)

Set to ON to propagate CMAKE_{C,CXX}_FLAGS <#variable:CMAKE_<LANG>_FLAGS> and their configuration dependent counterparts (e.g. CMAKE_C_FLAGS_DEBUG) automatically to the host compiler through nvcc's -Xcompiler flag. This helps make the generated host code match the rest of the system better. Sometimes certain flags give nvcc problems, and this will help you turn the flag propagation off. This does not affect the flags supplied directly to nvcc via CUDA_NVCC_FLAGS or through the OPTION flags specified through cuda_add_library(), cuda_add_executable(), or cuda_wrap_srcs(). Flags used for shared library compilation are not affected by this flag.

CUDA_SEPARABLE_COMPILATION (Default: OFF)

If set this will enable separable compilation for all CUDA runtime object files. If used outside of cuda_add_executable() and cuda_add_library() (e.g. calling cuda_wrap_srcs() directly), cuda_compute_separable_compilation_object_file_name() and cuda_link_separable_compilation_objects() should be called.

CUDA_SOURCE_PROPERTY_FORMAT

Added in version 3.3.

If this source file property is set, it can override the format specified to cuda_wrap_srcs() (OBJ, PTX, CUBIN, or FATBIN). If an input source file is not a .cu file, setting this file will cause it to be treated as a .cu file. See documentation for set_source_files_properties on how to set this property.

CUDA_USE_STATIC_CUDA_RUNTIME (Default: ON)

Added in version 3.3.

When enabled the static version of the CUDA runtime library will be used in CUDA_LIBRARIES. If the version of CUDA configured doesn't support this option, then it will be silently disabled.

CUDA_VERBOSE_BUILD (Default: OFF)

Set to ON to see all the commands used when building the CUDA file. When using a Makefile generator the value defaults to VERBOSE (run make VERBOSE=1 to see output), although setting CUDA_VERBOSE_BUILD to ON will always print the output.

### Commands
The script creates the following functions and macros (in alphabetical order):

```
cuda_add_cufft_to_target(<cuda_target>)
```

Adds the cufft library to the target (can be any target). Handles whether you are in emulation mode or not.

```
cuda_add_cublas_to_target(<cuda_target>)
```

Adds the cublas library to the target (can be any target). Handles whether you are in emulation mode or not.

```
cuda_add_executable(<cuda_target> <file>...

                    [WIN32] [MACOSX_BUNDLE] [EXCLUDE_FROM_ALL] [OPTIONS ...])
```

Creates an executable <cuda_target> which is made up of the files specified. All of the non CUDA C files are compiled using the standard build rules specified by CMake and the CUDA files are compiled to object files using nvcc and the host compiler. In addition CUDA_INCLUDE_DIRS is added automatically to include_directories() <#command:include_directories>. Some standard CMake target calls can be used on the target after calling this macro (e.g. set_target_properties() <#command:set_target_properties> and target_link_libraries() <#command:target_link_libraries>), but setting properties that adjust compilation flags will not affect code compiled by nvcc. Such flags should be modified before calling cuda_add_executable(), cuda_add_library() or cuda_wrap_srcs().

```
cuda_add_library(<cuda_target> <file>...

                 [STATIC | SHARED | MODULE] [EXCLUDE_FROM_ALL] [OPTIONS ...])
```

Same as cuda_add_executable() except that a library is created.

```
cuda_build_clean_target()
```

Creates a convenience target that deletes all the dependency files generated. You should make clean after running this target to ensure the dependency files get regenerated.

```
cuda_compile(<generated_files> <file>... [STATIC | SHARED | MODULE]

             [OPTIONS ...])
```

Returns a list of generated files from the input source files to be used with add_library() <#command:add_library> or add_executable() <#command:add_executable>.

```
cuda_compile_ptx(<generated_files> <file>... [OPTIONS ...])
```

Returns a list of PTX files generated from the input source files.

```
cuda_compile_fatbin(<generated_files> <file>... [OPTIONS ...])
```

Added in version 3.1.

Returns a list of FATBIN files generated from the input source files.

```
cuda_compile_cubin(<generated_files> <file>... [OPTIONS ...])
```

Added in version 3.1.

Returns a list of CUBIN files generated from the input source files.

```
cuda_compute_separable_compilation_object_file_name(<output_file_var>

                                                    <cuda_target>

                                                    <object_files>)
```

Compute the name of the intermediate link file used for separable compilation. This file name is typically passed into CUDA_LINK_SEPARABLE_COMPILATION_OBJECTS. output_file_var is produced based on cuda_target the list of objects files that need separable compilation as specified by <object_files>. If the <object_files> list is empty, then <output_file_var> will be empty. This function is called automatically for cuda_add_library() and cuda_add_executable(). Note that this is a function and not a macro.

```
cuda_include_directories(path0 path1 ...)
```

Sets the directories that should be passed to nvcc (e.g. nvcc -Ipath0 -Ipath1 ...). These paths usually contain other .cu files.

```
cuda_link_separable_compilation_objects(<output_file_var> <cuda_target>

                                        <nvcc_flags> <object_files>)
```

Generates the link object required by separable compilation from the given object files. This is called automatically for cuda_add_executable() and cuda_add_library(), but can be called manually when using cuda_wrap_srcs() directly. When called from cuda_add_library() or cuda_add_executable() the <nvcc_flags> passed in are the same as the flags passed in via the OPTIONS argument. The only nvcc flag added automatically is the bitness flag as specified by CUDA_64_BIT_DEVICE_CODE. Note that this is a function instead of a macro.

```
cuda_select_nvcc_arch_flags(<out_variable> [<target_CUDA_architecture> ...])
```

Selects GPU arch flags for nvcc based on target_CUDA_architecture.

Values for target_CUDA_architecture:

- Auto: detects local machine GPU compute arch at runtime.

- Common and All: cover common and entire subsets of architectures.

- <name>: one of Fermi, Kepler, Maxwell, Kepler+Tegra, Kepler+Tesla, Maxwell+Tegra, Pascal.

- <ver>, <ver>(<ver>), <ver>+PTX, where <ver> is one of 2.0, 2.1, 3.0, 3.2, 3.5, 3.7, 5.0, 5.2, 5.3, 6.0, 6.2.

Returns list of flags to be added to CUDA_NVCC_FLAGS in <out_variable>. Additionally, sets <out_variable>_readable to the resulting numeric list.

Example:

```
cuda_select_nvcc_arch_flags(ARCH_FLAGS "3.0" "3.5+PTX" "5.2(5.0)" "Maxwell")
list(APPEND CUDA_NVCC_FLAGS ${ARCH_FLAGS})
```

More info on CUDA architectures: <https://en.wikipedia.org/wiki/CUDA>. Note that this is a function instead of a macro.

```
cuda_wrap_srcs(<cuda_target> <format> <generated_files> <file>...

               [STATIC | SHARED | MODULE] [OPTIONS ...])
```

This is where all the magic happens. cuda_add_executable(), cuda_add_library(), cuda_compile(), and cuda_compile_ptx() all call this function under the hood.

Given the list of files <file>... this macro generates custom commands that generate either PTX or linkable objects (use PTX or OBJ for the <format> argument to switch). Files that don't end with .cu or have the HEADER_FILE_ONLY property are ignored.

The arguments passed in after OPTIONS are extra command line options to give to nvcc. You can also specify per configuration options by specifying the name of the configuration followed by the options. General options must precede configuration specific options. Not all configurations need to be specified, only the ones provided will be used. For example:

```
cuda_add_executable(...

  OPTIONS -DFLAG=2 "-DFLAG_OTHER=space in flag"

  DEBUG -g

  RELEASE --use_fast_math

  RELWITHDEBINFO --use_fast_math;-g

  MINSIZEREL --use_fast_math)
```

For certain configurations (namely VS generating object files with CUDA_ATTACH_VS_BUILD_RULE_TO_CUDA_FILE set to ON), no generated file will be produced for the given cuda file. This is because when you add the cuda file to Visual Studio it knows that this file produces an object file and will link in the resulting object file automatically.

This script will also generate a separate cmake script that is used at build time to invoke nvcc. This is for several reasons:

- nvcc can return negative numbers as return values which confuses Visual Studio into thinking that the command succeeded. The script now checks the error codes and produces errors when there was a problem.

- nvcc has been known to not delete incomplete results when it encounters problems. This confuses build systems into thinking the target was generated when in fact an unusable file exists. The script now deletes the output files if there was an error.

- By putting all the options that affect the build into a file and then make the build rule dependent on the file, the output files will be regenerated when the options change.

This script also looks at optional arguments STATIC, SHARED, or MODULE to determine when to target the object compilation for a shared library. BUILD_SHARED_LIBS <#variable:BUILD_SHARED_LIBS> is ignored in cuda_wrap_srcs(), but it is respected in cuda_add_library(). On some systems special flags are added for building objects intended for shared libraries. A preprocessor macro, <target_name>_EXPORTS is defined when a shared library compilation is detected.

Flags passed into add_definitions with -D or /D are passed along to nvcc.

### Result Variables
The script defines the following variables:

CUDA_VERSION_MAJOR

The major version of cuda as reported by nvcc.

CUDA_VERSION_MINOR

The minor version.

CUDA_VERSION, CUDA_VERSION_STRING

Full version in the X.Y format.

CUDA_HAS_FP16

Added in version 3.6: Whether a short float (float16, fp16) is supported.

CUDA_TOOLKIT_ROOT_DIR

Path to the CUDA Toolkit (defined if not set).

CUDA_SDK_ROOT_DIR

Path to the CUDA SDK. Use this to find files in the SDK. This script will not directly support finding specific libraries or headers, as that isn't supported by NVIDIA. If you want to change libraries when the path changes see the FindCUDA.cmake script for an example of how to clear these variables. There are also examples of how to use the CUDA_SDK_ROOT_DIR to locate headers or libraries, if you so choose (at your own risk).

CUDA_INCLUDE_DIRS

Include directory for cuda headers. Added automatically for cuda_add_executable() and cuda_add_library().

CUDA_LIBRARIES

Cuda RT library.

CUDA_CUFFT_LIBRARIES

Device or emulation library for the Cuda FFT implementation (alternative to cuda_add_cufft_to_target() macro)

CUDA_CUBLAS_LIBRARIES

Device or emulation library for the Cuda BLAS implementation (alternative to cuda_add_cublas_to_target() macro).

CUDA_cudart_static_LIBRARY

Statically linkable cuda runtime library. Only available for CUDA version 5.5+.

CUDA_cudadevrt_LIBRARY

Added in version 3.7: Device runtime library. Required for separable compilation.

CUDA_cupti_LIBRARY

CUDA Profiling Tools Interface library. Only available for CUDA version 4.0+.

CUDA_curand_LIBRARY

CUDA Random Number Generation library. Only available for CUDA version 3.2+.

CUDA_cusolver_LIBRARY

Added in version 3.2: CUDA Direct Solver library. Only available for CUDA version 7.0+.

CUDA_cusparse_LIBRARY

CUDA Sparse Matrix library. Only available for CUDA version 3.2+.

CUDA_npp_LIBRARY

NVIDIA Performance Primitives lib. Only available for CUDA version 4.0+.

CUDA_nppc_LIBRARY

NVIDIA Performance Primitives lib (core). Only available for CUDA version 5.5+.

CUDA_nppi_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 5.5 - 8.0.

CUDA_nppial_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppicc_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppicom_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0 - 10.2. Replaced by nvjpeg.

CUDA_nppidei_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppif_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppig_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppim_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppist_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppisu_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_nppitc_LIBRARY

NVIDIA Performance Primitives lib (image processing). Only available for CUDA version 9.0.

CUDA_npps_LIBRARY

NVIDIA Performance Primitives lib (signal processing). Only available for CUDA version 5.5+.

CUDA_nvcuvenc_LIBRARY

CUDA Video Encoder library. Only available for CUDA version 3.2+. Windows only.

CUDA_nvcuvid_LIBRARY

CUDA Video Decoder library. Only available for CUDA version 3.2+. Windows only.

CUDA_nvToolsExt_LIBRARY

Added in version 3.16: NVIDA CUDA Tools Extension library. Available for CUDA version 5+.

CUDA_OpenCL_LIBRARY

Added in version 3.16: NVIDA CUDA OpenCL library. Available for CUDA version 5+.

### FindDart
Deprecated since version 3.27: This module is available only if policy CMP0145 <#policy:CMP0145> is not set to NEW.

Finds DART:

```
find_package(DART [...])
```

This module looks for the dart testing software and sets DART_ROOT to point to where it found it.

### Result Variables
This module defines the following variables:

Dart_FOUND

Added in version 3.3.

Boolean indicating whether DART was found.

### Cache Variables
The following cache variables may also be set:

DART_ROOT

The path to the Dart root installation.

### FindGCCXML
Changed in version 4.1: This module is available only if policy CMP0188 <#policy:CMP0188> is not set to NEW. Port projects to search for CastXML by calling find_program() <#command:find_program> directly.

Finds the GCC-XML front-end executable:

```
find_package(GCCXML [...])
```

### Cache Variables
The following cache variables may also be set:

GCCXML

The GCC-XML front-end executable.

### Examples
In new code, find CastXML with find_program() <#command:find_program> instead:

```
find_program(CASTXML_EXECUTABLE castxml)
```

### FindGDAL
Deprecated since version 4.0: GDAL 3.5 and above provide a GDALConfig.cmake package configuration file. Call find_package(GDAL CONFIG) to find it directly and avoid using this find module. For further details, see GDAL's documentation on CMake integration <https://gdal.org/en/latest/development/cmake.html>.

Finds Geospatial Data Abstraction Library (GDAL):

```
find_package(GDAL [<version>] [...])
```

### Imported Targets
This module provides the following Imported Targets <#imported-targets>:

GDAL::GDAL

Added in version 3.14.

Target encapsulating the GDAL usage requirements, available only if GDAL has been found.

### Result Variables
This module defines the following variables:

GDAL_FOUND

Boolean indicating whether (the requested version of) GDAL was found.

GDAL_VERSION

Added in version 3.14.

The version of GDAL found.

GDAL_INCLUDE_DIRS

Include directories for GDAL headers.

GDAL_LIBRARIES

Libraries to link to GDAL.

### Cache Variables
The following cache variables may also be set:

GDAL_INCLUDE_DIR

The directory containing <gdal.h>.

GDAL_LIBRARY

The libgdal library file.

### Hints
The following variables may be set to modify the search strategy:

GDAL_DIR or GDAL_ROOT

Set one of these environment variables to specify the GDAL installation prefix.

FindGDAL_SKIP_GDAL_CONFIG

If set, gdal-config will not be used. This can be useful if there are GDAL libraries built with autotools (which provide the tool) and CMake (which do not) in the same environment.

GDAL_ADDITIONAL_LIBRARY_VERSIONS

Extra versions of library names to search for.

### Examples
Finding GDAL in config mode without using this module and linking its imported target to a project target:

```
find_package(GDAL CONFIG)
target_link_libraries(example PRIVATE GDAL::GDAL)
```

### FindITK
This module no longer exists.

This module existed in versions of CMake prior to 3.1, but became only a thin wrapper around find_package(ITK NO_MODULE) to provide compatibility for projects using long-outdated conventions. Now find_package(ITK) will search for ITKConfig.cmake directly.

### FindPythonInterp
Changed in version 3.27: This module is available only if policy CMP0148 <#policy:CMP0148> is not set to NEW.

Deprecated since version 3.12: Use FindPython3 <#module:FindPython3>, FindPython2 <#module:FindPython2>, or FindPython <#module:FindPython> instead.

Finds the Python interpreter and determines the location of its executable:

```
find_package(PythonInterp [<version>] [...])
```

Note:

When using both this and the FindPythonLibs <#module:FindPythonLibs> module, call find_package(PythonInterp) before find_package(PythonLibs). This ensures that the detected interpreter version is used to guide the selection of compatible libraries, resulting in a consistent PYTHON_LIBRARIES value.

Note:

A call to find_package(PythonInterp ${V}) for Python version V may find a python executable with no version suffix. In this case no attempt is made to avoid Python executables from other versions. Use FindPython3 <#module:FindPython3>, FindPython2 <#module:FindPython2>, or FindPython <#module:FindPython> instead.

### Result Variables
This module defines the following variables:

PythonInterp_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Python executable was found.

PYTHON_VERSION_STRING

Python version found (e.g., 2.5.2).

PYTHON_VERSION_MAJOR

Python major version found (e.g., 2).

PYTHON_VERSION_MINOR

Python minor version found (e.g., 5).

PYTHON_VERSION_PATCH

Python patch version found (e.g., 2).

### Cache Variables
The following cache variables may also be set:

PYTHON_EXECUTABLE

The path to the Python interpreter.

### Hints
This module accepts the following variables before calling find_package(PythonInterp):

Python_ADDITIONAL_VERSIONS

This variable can be used to specify a list of version numbers that should be taken into account when searching for Python.

### Deprecated Variables
The following variables are provided for backward compatibility:

PYTHONINTERP_FOUND

Deprecated since version 3.12: Use PythonInterp_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Python executable was found.

### Examples
Finding the Python interpreter in earlier versions of CMake:

```
find_package(PythonInterp)
execute_process(COMMAND ${PYTHON_EXECUTABLE} --help)
```

Starting with CMake 3.12, the Python interpreter can be found using the FindPython <#module:FindPython> module. The equivalent example using the modern approach is:

```
find_package(Python)
execute_process(COMMAND ${Python_EXECUTABLE} --help)
```

### FindPythonLibs
Changed in version 3.27: This module is available only if policy CMP0148 <#policy:CMP0148> is not set to NEW.

Deprecated since version 3.12: Use FindPython3 <#module:FindPython3>, FindPython2 <#module:FindPython2>, or FindPython <#module:FindPython> instead.

Finds the Python installation and determines the location of its include directories and libraries, as well as the name of the Python library to link against:

```
find_package(PythonLibs [<version>] [...])
```

Note:

When using both this and the FindPythonInterp <#module:FindPythonInterp> module, call find_package(PythonInterp) before find_package(PythonLibs). This ensures that the detected interpreter version is used to guide the selection of compatible libraries, resulting in a consistent PYTHON_LIBRARIES value.

### Result Variables
This module defines the following variables:

PythonLibs_FOUND

Added in version 3.3.

Boolean indicating whether the (requested version of) Python libraries were found.

PYTHONLIBS_VERSION_STRING

The version of the Python libraries found.

PYTHON_LIBRARIES

Libraries needed to link against to use Python.

PYTHON_INCLUDE_DIRS

Include directories needed to use Python.

### Cache Variables
The following cache variables may also be set to specify the Python installation to use:

PYTHON_LIBRARY

The path to the Python library.

PYTHON_INCLUDE_DIR

The directory containing the Python.h header file.

### Hints
This module accepts the following variables before calling find_package(PythonLibs):

Python_ADDITIONAL_VERSIONS

This variable can be used to specify a list of version numbers that should be taken into account when searching for Python.

### Deprecated Variables
The following variables are provided for backward compatibility:

PYTHONLIBS_FOUND

Deprecated since version 3.12: Use PythonLibs_FOUND, which has the same value.

Boolean indicating whether the (requested version of) Python libraries were found.

PYTHON_DEBUG_LIBRARIES

Deprecated since version 2.8.8: Use PYTHON_LIBRARIES instead.

Result variable that holds the path to the debug library.

PYTHON_INCLUDE_PATH

Deprecated since version 2.8.0: Use PYTHON_INCLUDE_DIR or PYTHON_INCLUDE_DIRS instead.

Result variable that holds the path to the directory containing the Python.h header file.

### Examples
In earlier versions of CMake, Python libraries were found and used in a project like this:

```
find_package(PythonLibs)
target_link_libraries(app PRIVATE ${PYTHON_LIBRARIES})
target_include_directories(app PRIVATE ${PYTHON_INCLUDE_DIRS})
```

Starting with CMake 3.12, Python libraries can be found using the FindPython <#module:FindPython> module. The equivalent example using the modern approach with an imported target is:

```
find_package(Python COMPONENTS Development)
target_link_libraries(app PRIVATE Python::Python)
```

### FindQt
Deprecated since version 3.14: This module is available only if policy CMP0084 <#policy:CMP0084> is not set to NEW. It supports only Qt3 and Qt4. For Qt5 or later versions see cmake-qt(7) <#manual:cmake-qt(7)>.

Finds an installed version of Qt3 or Qt4:

```
find_package(Qt [...])
```

Qt is a cross-platform application development framework for creating graphical user interfaces and applications.

Use this module only if the project can work with both Qt3 and Qt4 versions. If a specific version is required, use FindQt4 <#module:FindQt4> or FindQt3 <#module:FindQt3> module directly.

Behavior:

- If multiple Qt versions are found, the user must set the preferred major Qt version with the DESIRED_QT_VERSION variable.

- If only one Qt version is found, then the DESIRED_QT_VERSION is set automatically.

- Once the DESIRED_QT_VERSION variable is set, the corresponding FindQt3 <#module:FindQt3> or FindQt4 <#module:FindQt4> module is included.

### Result Variables
This module defines the following variables:

QT4_INSTALLED

TRUE if Qt4 was found.

QT3_INSTALLED

TRUE if Qt3 was found.

### Hints
QT_REQUIRED

If this variable is set to TRUE before calling find_package(Qt), CMake will raise an error if neither Qt3 nor Qt4 is found.

DESIRED_QT_VERSION

Specifies the Qt major version to use. Can be either 3, 4, or empty, to search for version automatically.

### Examples
Finding Qt3 or Qt4 version:

```
find_package(Qt)
```

### FindUnixCommands
Deprecated since version 3.26: Use ${CMAKE_COMMAND} -E <#cmdoption-cmake-E> subcommands instead.

Finds Unix commands bash, cp, gzip, mv, rm, and tar, including the ones from Cygwin or MSYS:

```
find_package(UnixCommands [...])
```

### Result Variables
This module defines the following variables:

UnixCommands_FOUND

Added in version 3.3.

Boolean indicating whether Unix commands were found.

### Cache Variables
The following cache variables may also be set:

BASH

The path to the bash command-line executable.

CP

The path to the cp command-line executable.

GZIP

The path to the gzip command-line executable.

MV

The path to the mv command-line executable.

RM

The path to the rm command-line executable.

TAR

The path to the tar command-line executable.

### FindVTK
This module no longer exists.

This module existed in versions of CMake prior to 3.1, but became only a thin wrapper around find_package(VTK NO_MODULE) to provide compatibility for projects using long-outdated conventions. Now find_package(VTK) will search for VTKConfig.cmake directly.

### FindwxWindows
Deprecated since version 3.0: Replaced by FindwxWidgets <#module:FindwxWidgets>.

Finds the wxWidgets (formerly known as wxWindows) installation and determines the locations of its include directories and libraries, as well as the name of the library:

```
find_package(wxWindows [...])
```

wxWidgets 2.6.x is supported for monolithic builds, such as those compiled in the wx/build/msw directory using:

```
nmake -f makefile.vc BUILD=debug SHARED=0 USE_OPENGL=1 MONOLITHIC=1
```

### Result Variables
This module defines the following variables:

WXWINDOWS_FOUND

Boolean indicating whether the wxWidgets was found.

WXWINDOWS_LIBRARIES

Libraries needed to link against to use wxWidgets. This includes paths to the wxWidgets libraries and any additional linker flags, typically derived from the output of wx-config --libs on Unix/Linux systems.

CMAKE_WXWINDOWS_CXX_FLAGS

Compiler options needed to use wxWidgets (if any). On Linux, this corresponds to the output of wx-config --cxxflags.

WXWINDOWS_INCLUDE_DIR

The directory containing the wx/wx.h and wx/setup.h header files.

WXWINDOWS_LINK_DIRECTORIES

Link directories, useful for setting rpath on Unix-like platforms.

WXWINDOWS_DEFINITIONS

Extra compile definitions needed to use wxWidgets (if any).

### Hints
This module accepts the following variables before calling the find_package(wxWindows):

WXWINDOWS_USE_GL

Set this variable to boolean true to require OpenGL support.

HAVE_ISYSTEM

Set this variable to boolean true to replace -I compiler options with -isystem when the C++ compiler is GNU (g++).

### Deprecated Variables
The following variables are provided for backward compatibility:

CMAKE_WX_CAN_COMPILE

Deprecated since version 1.8: Replaced by the WXWINDOWS_FOUND variable with the same value.

WXWINDOWS_LIBRARY

Deprecated since version 1.8: Replaced by the WXWINDOWS_LIBRARIES variable with the same value.

CMAKE_WX_CXX_FLAGS

Deprecated since version 1.8: Replaced by the CMAKE_WXWINDOWS_CXX_FLAGS variable with the same value.

WXWINDOWS_INCLUDE_PATH

Deprecated since version 1.8: Replaced by the WXWINDOWS_INCLUDE_DIR variable with the same value.

### Example: Finding wxWidgets in Earlier CMake Versions
In earlier versions of CMake, wxWidgets (wxWindows) could be found using:

```
find_package(wxWindows)
```

To request OpenGL support, the WXWINDOWS_USE_GL variable could be set before calling find_package():

```
set(WXWINDOWS_USE_GL ON)
find_package(wxWindows)
```

Using wxWidgets (wxWindows) in CMake was commonly done by including the Use_wxWindows <#module:Use_wxWindows> module, which would find wxWidgets and set the appropriate libraries, include directories, and compiler flags:

```
include(Use_wxWindows)
```

### Example: Finding wxWidgets as of CMake 3.0
Starting with CMake 3.0, wxWidgets can be found using the FindwxWidgets <#module:FindwxWidgets> module:

```
find_package(wxWidgets)
```

### Legacy CPack Modules
These modules used to be mistakenly exposed to the user, and have been moved out of user visibility. They are for CPack internal use, and should never be used directly.

### CPackArchive
Added in version 3.9.

The documentation for the CPack Archive generator has moved here: CPack Archive Generator <#cpack_gen:CPack Archive Generator>

### CPackBundle
The documentation for the CPack Bundle generator has moved here: CPack Bundle Generator <#cpack_gen:CPack Bundle Generator>

### CPackCygwin
The documentation for the CPack Cygwin generator has moved here: CPack Cygwin Generator <#cpack_gen:CPack Cygwin Generator>

### CPackDeb
The documentation for the CPack DEB generator has moved here: CPack DEB Generator <#cpack_gen:CPack DEB Generator>

### CPackDMG
The documentation for the CPack DragNDrop generator has moved here: CPack DragNDrop Generator <#cpack_gen:CPack DragNDrop Generator>

### CPackFreeBSD
Added in version 3.10.

The documentation for the CPack FreeBSD generator has moved here: CPack FreeBSD Generator <#cpack_gen:CPack FreeBSD Generator>

### CPackNSIS
The documentation for the CPack NSIS generator has moved here: CPack NSIS Generator <#cpack_gen:CPack NSIS Generator>

### CPackNuGet
Added in version 3.12.

The documentation for the CPack NuGet generator has moved here: CPack NuGet Generator <#cpack_gen:CPack NuGet Generator>

### CPackProductBuild
Added in version 3.7.

The documentation for the CPack productbuild generator has moved here: CPack productbuild Generator <#cpack_gen:CPack productbuild Generator>

### CPackRPM
The documentation for the CPack RPM generator has moved here: CPack RPM Generator <#cpack_gen:CPack RPM Generator>

### CPackWIX
The documentation for the CPack WIX generator has moved here: CPack WIX Generator <#cpack_gen:CPack WIX Generator>

### Miscellaneous Modules
These internal modules are not intended to be included directly in projects:

### CMakeFindPackageMode
This module is executed by cmake when invoked with the --find-package <#find-package-tool-mode> option to locate the requested package.

Note:

This is internal module and is not meant to be included directly in the project. For usage details, refer to the --find-package <#find-package-tool-mode> documentation.

### CMakeGraphVizOptions
Note:

This module is not intended to be included in CMake projects directly. It once contained the information for using Graphviz in CMake. For Graphviz usage in CMake refer to the cmake --graphviz <#cmdoption-cmake-graphviz>.

### CTestScriptMode
Note:

This module is not intended to be included or invoked directly by project code. It is internally used by CTest running in script mode (-S) to determine current system. For usage details refer to the ctest -S <#cmdoption-ctest-S>.

### Findosg_functions
Note:

This module is not intended to be included or invoked directly by project code during typical use of find_package() <#command:find_package> command. It is internally used by OpenSceneGraph (OSG) find modules to assist with searching for OSG libraries and NodeKits. For usage details refer to the FindOpenSceneGraph <#module:FindOpenSceneGraph> module.

### SquishTestScript
Note:

This module is not intended to be included directly in a CMake project. It is an internal CMake test script used to launch GUI tests with Squish. For usage details, refer to the squish_add_test() <#command:squish_add_test> command documentation in the FindSquish module.

## Copyright
2000-2026 Kitware, Inc. and Contributors